28697765231520 has 480 divisors, whose sum is σ = 126270171409536. Its totient is φ = 5963171788800.

The previous prime is 28697765231503. The next prime is 28697765231539. The reversal of 28697765231520 is 2513256779682.

28697765231520 is a `hidden beast` number, since 2 + 8 + 6 + 9 + 7 + 76 + 5 + 2 + 31 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 13380871 + ... + 15376710.

Almost surely, 2^{28697765231520} is an apocalyptic number.

28697765231520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28697765231520 is an abundant number, since it is smaller than the sum of its proper divisors (97572406178016).

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

28697765231520 is a wasteful number, since it uses less digits than its factorization.

28697765231520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28757626 (or 28757609 counting only the distinct ones).

The product of its (nonzero) digits is 76204800, while the sum is 63.

The spelling of 28697765231520 in words is "twenty-eight trillion, six hundred ninety-seven billion, seven hundred sixty-five million, two hundred thirty-one thousand, five hundred twenty".