90644590 has 8 divisors (see below), whose sum is σ = 163160280. Its totient is φ = 36257832.

The previous prime is 90644581. The next prime is 90644641. The reversal of 90644590 is 9544609.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4532220 + ... + 4532239.

It is an arithmetic number, because the mean of its divisors is an integer number (20395035).

Almost surely, 2^90644590 is an apocalyptic number.

90644590 is a deficient number, since it is larger than the sum of its proper divisors (72515690).

90644590 is a wasteful number, since it uses less digits than its factorization.

90644590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9064466.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 90644590 is about 9520.7452439397. The cubic root of 90644590 is about 449.2078078681.

It can be divided in two parts, 90 and 644590, that added together give a triangular number (644680 = T₁₁₃₅).

The spelling of 90644590 in words is "ninety million, six hundred forty-four thousand, five hundred ninety".