90917505 has 128 divisors (see below), whose sum is σ = 199065600. Its totient is φ = 38472192.

The previous prime is 90917467. The next prime is 90917507. The reversal of 90917505 is 50571909.

It is a happy number.

It is not a de Polignac number, because 90917505 - 2⁶ = 90917441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90917505.

It is not an unprimeable number, because it can be changed into a prime (90917507) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1021501 + ... + 1021589.

It is an arithmetic number, because the mean of its divisors is an integer number (1555200).

Almost surely, 2^90917505 is an apocalyptic number.

It is an amenable number.

90917505 is an abundant number, since it is smaller than the sum of its proper divisors (108148095).

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

90917505 is a wasteful number, since it uses less digits than its factorization.

90917505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 14175, while the sum is 36.

The square root of 90917505 is about 9535.0671208964. The cubic root of 90917505 is about 449.6581848711.

The spelling of 90917505 in words is "ninety million, nine hundred seventeen thousand, five hundred five".