28878016956 has 12 divisors (see below), whose sum is σ = 67382039592. Its totient is φ = 9626005648.

The previous prime is 28878016949. The next prime is 28878017017. The reversal of 28878016956 is 65961087882.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28878016956² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28878016956.

It is a congruent number.

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, 1203250695 + ... + 1203250718.

It is an arithmetic number, because the mean of its divisors is an integer number (5615169966).

Almost surely, 2^28878016956 is an apocalyptic number.

It is an amenable number.

28878016956 is an abundant number, since it is smaller than the sum of its proper divisors (38504022636).

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

28878016956 is a wasteful number, since it uses less digits than its factorization.

28878016956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406501420 (or 2406501418 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 60.

The spelling of 28878016956 in words is "twenty-eight billion, eight hundred seventy-eight million, sixteen thousand, nine hundred fifty-six".