28312736720 has 40 divisors (see below), whose sum is σ = 66809619744. Its totient is φ = 11156061312.

The previous prime is 28312736713. The next prime is 28312736723. The reversal of 28312736720 is 2763721382.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×28312736720² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28312736723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2635754 + ... + 2646473.

Almost surely, 2^28312736720 is an apocalyptic number.

28312736720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28312736720 is an abundant number, since it is smaller than the sum of its proper divisors (38496883024).

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

28312736720 is a wasteful number, since it uses less digits than its factorization.

28312736720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5282307 (or 5282301 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 41.

The spelling of 28312736720 in words is "twenty-eight billion, three hundred twelve million, seven hundred thirty-six thousand, seven hundred twenty".