28755657 has 12 divisors (see below), whose sum is σ = 47469760. Its totient is φ = 16431768.

The previous prime is 28755641. The next prime is 28755667. The reversal of 28755657 is 75655782.

28755657 is a `hidden beast` number, since 2 + 87 + 5 + 565 + 7 = 666.

It is not a de Polignac number, because 28755657 - 2⁴ = 28755641 is a prime.

It is a super-3 number, since 3×28755657³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28755667) 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, 228157 + ... + 228282.

Almost surely, 2^28755657 is an apocalyptic number.

It is an amenable number.

28755657 is a deficient number, since it is larger than the sum of its proper divisors (18714103).

28755657 is a wasteful number, since it uses less digits than its factorization.

28755657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456452 (or 456449 counting only the distinct ones).

The product of its digits is 588000, while the sum is 45.

The square root of 28755657 is about 5362.4301394051. The cubic root of 28755657 is about 306.3663752081.

The spelling of 28755657 in words is "twenty-eight million, seven hundred fifty-five thousand, six hundred fifty-seven".