90688915 has 4 divisors (see below), whose sum is σ = 108826704. Its totient is φ = 72551128.

The previous prime is 90688909. The next prime is 90688943. The reversal of 90688915 is 51988609.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51988609 = 6451 ⋅8059.

It is a cyclic number.

It is not a de Polignac number, because 90688915 - 2¹⁵ = 90656147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9068887 + ... + 9068896.

It is an arithmetic number, because the mean of its divisors is an integer number (27206676).

Almost surely, 2^90688915 is an apocalyptic number.

90688915 is a deficient number, since it is larger than the sum of its proper divisors (18137789).

90688915 is a wasteful number, since it uses less digits than its factorization.

90688915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18137788.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 90688915 is about 9523.0727709075. The cubic root of 90688915 is about 449.2810164713.

The spelling of 90688915 in words is "ninety million, six hundred eighty-eight thousand, nine hundred fifteen".