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28025697 = 372832297
BaseRepresentation
bin110101011101…
…0001101100001
31221201212000210
41222322031201
524133310242
62440404333
7460133400
oct152721541
957655023
1028025697
1114902137
1294766a9
135a6346b
143a17637
1526d8d9c
hex1aba361

28025697 has 24 divisors (see below), whose sum is σ = 44011296. Its totient is φ = 15814848.

The previous prime is 28025693. The next prime is 28025713. The reversal of 28025697 is 79652082.

It is a happy number.

It is not a de Polignac number, because 28025697 - 22 = 28025693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28025693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11053 + ... + 13349.

It is an arithmetic number, because the mean of its divisors is an integer number (1833804).

Almost surely, 228025697 is an apocalyptic number.

It is an amenable number.

28025697 is a deficient number, since it is larger than the sum of its proper divisors (15985599).

28025697 is a wasteful number, since it uses less digits than its factorization.

28025697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2397 (or 2390 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 28025697 is about 5293.9302035444. The cubic root of 28025697 is about 303.7517631018.

The spelling of 28025697 in words is "twenty-eight million, twenty-five thousand, six hundred ninety-seven".

Divisors: 1 3 7 21 49 83 147 249 581 1743 2297 4067 6891 12201 16079 48237 112553 190651 337659 571953 1334557 4003671 9341899 28025697