90564973 has 4 divisors (see below), whose sum is σ = 91840608. Its totient is φ = 89289340.

The previous prime is 90564959. The next prime is 90564989. The reversal of 90564973 is 37946509.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37946509 = 1103 ⋅34403.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90564973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90564953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637711 + ... + 637852.

It is an arithmetic number, because the mean of its divisors is an integer number (22960152).

Almost surely, 2^90564973 is an apocalyptic number.

It is an amenable number.

90564973 is a deficient number, since it is larger than the sum of its proper divisors (1275635).

90564973 is a wasteful number, since it uses less digits than its factorization.

90564973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275634.

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 90564973 is about 9516.5630875858. The cubic root of 90564973 is about 449.0762498996.

The spelling of 90564973 in words is "ninety million, five hundred sixty-four thousand, nine hundred seventy-three".