28655665 has 16 divisors (see below), whose sum is σ = 35712000. Its totient is φ = 22057920.

The previous prime is 28655657. The next prime is 28655681. The reversal of 28655665 is 56655682.

It is not a de Polignac number, because 28655665 - 2³ = 28655657 is a prime.

It is a super-2 number, since 2×28655665² = 1642294273184450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13336 + ... + 15334.

It is an arithmetic number, because the mean of its divisors is an integer number (2232000).

Almost surely, 2^28655665 is an apocalyptic number.

It is an amenable number.

28655665 is a deficient number, since it is larger than the sum of its proper divisors (7056335).

28655665 is a wasteful number, since it uses less digits than its factorization.

28655665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112.

The product of its digits is 432000, while the sum is 43.

The square root of 28655665 is about 5353.0986353700. The cubic root of 28655665 is about 306.0108537025.

The spelling of 28655665 in words is "twenty-eight million, six hundred fifty-five thousand, six hundred sixty-five".