28657655 has 32 divisors (see below), whose sum is σ = 40037760. Its totient is φ = 19514880.

The previous prime is 28657637. The next prime is 28657661. The reversal of 28657655 is 55675682.

It is not a de Polignac number, because 28657655 - 2²⁰ = 27609079 is a prime.

It is a super-2 number, since 2×28657655² = 1642522380198050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43025 + ... + 43685.

It is an arithmetic number, because the mean of its divisors is an integer number (1251180).

Almost surely, 2^28657655 is an apocalyptic number.

28657655 is a deficient number, since it is larger than the sum of its proper divisors (11380105).

28657655 is a wasteful number, since it uses less digits than its factorization.

28657655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731.

The product of its digits is 504000, while the sum is 44.

The square root of 28657655 is about 5353.2845057964. The cubic root of 28657655 is about 306.0179372059.

The spelling of 28657655 in words is "twenty-eight million, six hundred fifty-seven thousand, six hundred fifty-five".