28617779888 has 20 divisors (see below), whose sum is σ = 55513061520. Its totient is φ = 14291828544.

The previous prime is 28617779863. The next prime is 28617779891. The reversal of 28617779888 is 88897771682.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1052495 + ... + 1079342.

It is an arithmetic number, because the mean of its divisors is an integer number (2775653076).

Almost surely, 2^28617779888 is an apocalyptic number.

It is an amenable number.

28617779888 is a deficient number, since it is larger than the sum of its proper divisors (26895281632).

28617779888 is a wasteful number, since it uses less digits than its factorization.

28617779888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2132684 (or 2132678 counting only the distinct ones).

The product of its digits is 151732224, while the sum is 71.

The spelling of 28617779888 in words is "twenty-eight billion, six hundred seventeen million, seven hundred seventy-nine thousand, eight hundred eighty-eight".