90390517 has 16 divisors (see below), whose sum is σ = 104993280. Its totient is φ = 76220928.

The previous prime is 90390499. The next prime is 90390533. The reversal of 90390517 is 71509309.

It is a de Polignac number, because none of the positive numbers 2^k-90390517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90390577) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162003 + ... + 162559.

It is an arithmetic number, because the mean of its divisors is an integer number (6562080).

Almost surely, 2^90390517 is an apocalyptic number.

90390517 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

It is an amenable number.

90390517 is a deficient number, since it is larger than the sum of its proper divisors (14602763).

90390517 is a wasteful number, since it uses less digits than its factorization.

90390517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900.

The product of its (nonzero) digits is 8505, while the sum is 34.

The square root of 90390517 is about 9507.3927551143. The cubic root of 90390517 is about 448.7877115443.

The spelling of 90390517 in words is "ninety million, three hundred ninety thousand, five hundred seventeen".