28720649316 has 12 divisors (see below), whose sum is σ = 67014848432. Its totient is φ = 9573549768.

The previous prime is 28720649291. The next prime is 28720649323. The reversal of 28720649316 is 61394602782.

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

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, 1196693710 + ... + 1196693733.

Almost surely, 2^28720649316 is an apocalyptic number.

It is an amenable number.

28720649316 is an abundant number, since it is smaller than the sum of its proper divisors (38294199116).

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

28720649316 is a wasteful number, since it uses less digits than its factorization.

28720649316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393387450 (or 2393387448 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 28720649316 in words is "twenty-eight billion, seven hundred twenty million, six hundred forty-nine thousand, three hundred sixteen".