28639055972 has 12 divisors (see below), whose sum is σ = 50202868716. Its totient is φ = 14295379200.

The previous prime is 28639055969. The next prime is 28639055989. The reversal of 28639055972 is 27955093682.

It can be written as a sum of positive squares in 2 ways, for example, as 22387939876 + 6251116096 = 149626^2 + 79064^2 .

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, 6034529 + ... + 6039272.

It is an arithmetic number, because the mean of its divisors is an integer number (4183572393).

Almost surely, 2^28639055972 is an apocalyptic number.

It is an amenable number.

28639055972 is a deficient number, since it is larger than the sum of its proper divisors (21563812744).

28639055972 is a wasteful number, since it uses less digits than its factorization.

28639055972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12074398 (or 12074396 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 56.

The spelling of 28639055972 in words is "twenty-eight billion, six hundred thirty-nine million, fifty-five thousand, nine hundred seventy-two".