28731074660 has 36 divisors (see below), whose sum is σ = 62344380924. Its totient is φ = 11121698880.

The previous prime is 28731074651. The next prime is 28731074707. The reversal of 28731074660 is 6647013782.

It can be written as a sum of positive squares in 2 ways, for example, as 12859106404 + 15871968256 = 113398^2 + 125984^2 .

It is a super-2 number, since 2×28731074660² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 728207 + ... + 766646.

It is an arithmetic number, because the mean of its divisors is an integer number (1731788359).

Almost surely, 2^28731074660 is an apocalyptic number.

28731074660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28731074660 is an abundant number, since it is smaller than the sum of its proper divisors (33613306264).

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

28731074660 is a wasteful number, since it uses less digits than its factorization.

28731074660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494924 (or 1494891 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 44.

The spelling of 28731074660 in words is "twenty-eight billion, seven hundred thirty-one million, seventy-four thousand, six hundred sixty".