28713786520 has 32 divisors (see below), whose sum is σ = 65017537200. Its totient is φ = 11412355968.

The previous prime is 28713786427. The next prime is 28713786533. The reversal of 28713786520 is 2568731782.

It is a super-2 number, since 2×28713786520² (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, 2279850 + ... + 2292409.

Almost surely, 2^28713786520 is an apocalyptic number.

28713786520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28713786520 is an abundant number, since it is smaller than the sum of its proper divisors (36303750680).

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

28713786520 is a wasteful number, since it uses less digits than its factorization.

28713786520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4572427 (or 4572423 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 28713786520 in words is "twenty-eight billion, seven hundred thirteen million, seven hundred eighty-six thousand, five hundred twenty".