28904715156 has 24 divisors (see below), whose sum is σ = 67480902720. Its totient is φ = 9629681152.

The previous prime is 28904715139. The next prime is 28904715233. The reversal of 28904715156 is 65151740982.

It is a happy number.

It is a super-2 number, since 2×28904715156² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 629901 + ... + 674228.

It is an arithmetic number, because the mean of its divisors is an integer number (2811704280).

Almost surely, 2^28904715156 is an apocalyptic number.

It is an amenable number.

28904715156 is an abundant number, since it is smaller than the sum of its proper divisors (38576187564).

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

28904715156 is a wasteful number, since it uses less digits than its factorization.

28904715156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305983 (or 1305981 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 48.

The spelling of 28904715156 in words is "twenty-eight billion, nine hundred four million, seven hundred fifteen thousand, one hundred fifty-six".