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28312380 = 22325157291
BaseRepresentation
bin110110000000…
…0001100111100
31222021102021200
41230000030330
524221444010
62450455500
7462436245
oct154001474
958242250
1028312380
1114a88568
129594590
135b33ab5
143a8dccc
152743cc0
hex1b0033c

28312380 has 36 divisors (see below), whose sum is σ = 85881432. Its totient is φ = 7549920.

The previous prime is 28312369. The next prime is 28312387. The reversal of 28312380 is 8321382.

28312380 is a `hidden beast` number, since 283 + 1 + 2 + 380 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×283123802 = 1603181722528800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28312387) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78466 + ... + 78825.

Almost surely, 228312380 is an apocalyptic number.

28312380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28312380 is an abundant number, since it is smaller than the sum of its proper divisors (57569052).

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

28312380 is a wasteful number, since it uses less digits than its factorization.

28312380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157306 (or 157301 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28312380 is about 5320.9378872526. The cubic root of 28312380 is about 304.7839731586.

The spelling of 28312380 in words is "twenty-eight million, three hundred twelve thousand, three hundred eighty".

Divisors: 1 2 3 4 5 6 9 10 12 15 18 20 30 36 45 60 90 180 157291 314582 471873 629164 786455 943746 1415619 1572910 1887492 2359365 2831238 3145820 4718730 5662476 7078095 9437460 14156190 28312380