90915 has 32 divisors (see below), whose sum is σ = 172800. Its totient is φ = 40320.

The previous prime is 90911. The next prime is 90917. The reversal of 90915 is 51909.

It is a happy number.

It is not a de Polignac number, because 90915 - 2² = 90911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3121 + ... + 3149.

It is an arithmetic number, because the mean of its divisors is an integer number (5400).

2⁹⁰⁹¹⁵ is an apocalyptic number.

90915 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

90915 is a deficient number, since it is larger than the sum of its proper divisors (81885).

90915 is a wasteful number, since it uses less digits than its factorization.

90915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67.

The product of its (nonzero) digits is 405, while the sum is 24.

The square root of 90915 is about 301.5211435372. The cubic root of 90915 is about 44.9654055105.

The spelling of 90915 in words is "ninety thousand, nine hundred fifteen".