28912972864 has 56 divisors (see below), whose sum is σ = 59326272000. Its totient is φ = 13966218240.

The previous prime is 28912972813. The next prime is 28912972873. The reversal of 28912972864 is 46827921982.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28912972799 and 28912972808.

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 7 ways as a sum of consecutive naturals, for example, 1176252 + ... + 1200580.

Almost surely, 2^28912972864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28912972864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29663136000).

28912972864 is an abundant number, since it is smaller than the sum of its proper divisors (30413299136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28912972864 is a wasteful number, since it uses less digits than its factorization.

28912972864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24971 (or 24961 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 58.

The spelling of 28912972864 in words is "twenty-eight billion, nine hundred twelve million, nine hundred seventy-two thousand, eight hundred sixty-four".