90515988 has 72 divisors (see below), whose sum is σ = 239971200. Its totient is φ = 29500848.

The previous prime is 90515933. The next prime is 90515993. The reversal of 90515988 is 88951509.

90515988 is a `hidden beast` number, since 9 + 0 + 51 + 598 + 8 = 666.

It is a super-2 number, since 2×90515988² = 16386288167232288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 878745 + ... + 878847.

Almost surely, 2^90515988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90515988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119985600).

90515988 is an abundant number, since it is smaller than the sum of its proper divisors (149455212).

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

90515988 is a wasteful number, since it uses less digits than its factorization.

90515988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The square root of 90515988 is about 9513.9890687345. The cubic root of 90515988 is about 448.9952694842.

The spelling of 90515988 in words is "ninety million, five hundred fifteen thousand, nine hundred eighty-eight".