28875565641 has 32 divisors (see below), whose sum is σ = 42627789568. Its totient is φ = 17271118080.

The previous prime is 28875565637. The next prime is 28875565651. The reversal of 28875565641 is 14656557882.

It is not a de Polignac number, because 28875565641 - 2² = 28875565637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28875565651) by changing a digit.

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, 1428636 + ... + 1448706.

It is an arithmetic number, because the mean of its divisors is an integer number (1332118424).

Almost surely, 2^28875565641 is an apocalyptic number.

It is an amenable number.

28875565641 is a deficient number, since it is larger than the sum of its proper divisors (13752223927).

28875565641 is a wasteful number, since it uses less digits than its factorization.

28875565641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21121.

The product of its digits is 16128000, while the sum is 57.

The spelling of 28875565641 in words is "twenty-eight billion, eight hundred seventy-five million, five hundred sixty-five thousand, six hundred forty-one".