90806915520 has 168 divisors, whose sum is σ = 320779895904. Its totient is φ = 23560685568.

The previous prime is 90806915501. The next prime is 90806915527. The reversal of 90806915520 is 2551960809.

90806915520 is a `hidden beast` number, since 9 + 0 + 8 + 0 + 6 + 91 + 552 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90806915527) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 319524 + ... + 532643.

Almost surely, 2^90806915520 is an apocalyptic number.

90806915520 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

90806915520 is an abundant number, since it is smaller than the sum of its proper divisors (229972980384).

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

90806915520 is a wasteful number, since it uses less digits than its factorization.

90806915520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852227 (or 852214 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 90806915520 in words is "ninety billion, eight hundred six million, nine hundred fifteen thousand, five hundred twenty".