90915880 has 32 divisors (see below), whose sum is σ = 223158240. Its totient is φ = 33060160.

The previous prime is 90915863. The next prime is 90915883. The reversal of 90915880 is 8851909.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (90915883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102874 + ... + 103753.

It is an arithmetic number, because the mean of its divisors is an integer number (6973695).

Almost surely, 2^90915880 is an apocalyptic number.

It is an amenable number.

90915880 is an abundant number, since it is smaller than the sum of its proper divisors (132242360).

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

90915880 is a wasteful number, since it uses less digits than its factorization.

90915880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206649 (or 206645 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 90915880 is about 9534.9819087400. The cubic root of 90915880 is about 449.6555058898.

The spelling of 90915880 in words is "ninety million, nine hundred fifteen thousand, eight hundred eighty".