28880966978 has 4 divisors (see below), whose sum is σ = 43321450470. Its totient is φ = 14440483488.

The previous prime is 28880966923. The next prime is 28880966981. The reversal of 28880966978 is 87966908882.

28880966978 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15379224169 + 13501742809 = 124013^2 + 116197^2 .

It is a super-2 number, since 2×28880966978² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7220241743 + ... + 7220241746.

Almost surely, 2^28880966978 is an apocalyptic number.

28880966978 is a deficient number, since it is larger than the sum of its proper divisors (14440483492).

28880966978 is a wasteful number, since it uses less digits than its factorization.

28880966978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14440483491.

The product of its (nonzero) digits is 167215104, while the sum is 71.

The spelling of 28880966978 in words is "twenty-eight billion, eight hundred eighty million, nine hundred sixty-six thousand, nine hundred seventy-eight".