28720578588 has 36 divisors (see below), whose sum is σ = 72566200728. Its totient is φ = 8837100480.

The previous prime is 28720578563. The next prime is 28720578613. The reversal of 28720578588 is 88587502782.

It is an interprime number because it is at equal distance from previous prime (28720578563) and next prime (28720578613).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7078983 + ... + 7083038.

It is an arithmetic number, because the mean of its divisors is an integer number (2015727798).

Almost surely, 2^28720578588 is an apocalyptic number.

It is an amenable number.

28720578588 is an abundant number, since it is smaller than the sum of its proper divisors (43845622140).

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

28720578588 is a wasteful number, since it uses less digits than its factorization.

28720578588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14162054 (or 14162039 counting only the distinct ones).

The product of its (nonzero) digits is 20070400, while the sum is 60.

The spelling of 28720578588 in words is "twenty-eight billion, seven hundred twenty million, five hundred seventy-eight thousand, five hundred eighty-eight".