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28445640 = 23351012347
BaseRepresentation
bin110110010000…
…0101111001000
31222112012002020
41230200233020
524240230030
62453404440
7463532616
oct154405710
958465066
1028445640
11150696a3
129639720
135b7c652
143ac66b6
15276d510
hex1b20bc8

28445640 has 64 divisors (see below), whose sum is σ = 86218560. Its totient is φ = 7507200.

The previous prime is 28445639. The next prime is 28445689. The reversal of 28445640 is 4654482.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10947 + ... + 13293.

It is an arithmetic number, because the mean of its divisors is an integer number (1347165).

Almost surely, 228445640 is an apocalyptic number.

28445640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28445640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43109280).

28445640 is an abundant number, since it is smaller than the sum of its proper divisors (57772920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28445640 is a wasteful number, since it uses less digits than its factorization.

28445640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2462 (or 2458 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

The square root of 28445640 is about 5333.4454154889. The cubic root of 28445640 is about 305.2614080672.

The spelling of 28445640 in words is "twenty-eight million, four hundred forty-five thousand, six hundred forty".

Divisors: 1 2 3 4 5 6 8 10 12 15 20 24 30 40 60 101 120 202 303 404 505 606 808 1010 1212 1515 2020 2347 2424 3030 4040 4694 6060 7041 9388 11735 12120 14082 18776 23470 28164 35205 46940 56328 70410 93880 140820 237047 281640 474094 711141 948188 1185235 1422282 1896376 2370470 2844564 3555705 4740940 5689128 7111410 9481880 14222820 28445640