90731588 has 6 divisors (see below), whose sum is σ = 158780286. Its totient is φ = 45365792.

The previous prime is 90731549. The next prime is 90731603. The reversal of 90731588 is 88513709.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 58491904 + 32239684 = 7648^2 + 5678^2 .

It is a super-2 number, since 2×90731588² = 16464442122003488, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11341445 + ... + 11341452.

It is an arithmetic number, because the mean of its divisors is an integer number (26463381).

Almost surely, 2^90731588 is an apocalyptic number.

It is an amenable number.

90731588 is a deficient number, since it is larger than the sum of its proper divisors (68048698).

90731588 is a wasteful number, since it uses less digits than its factorization.

90731588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22682901 (or 22682899 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 90731588 is about 9525.3130132295. The cubic root of 90731588 is about 449.3514740441.

It can be divided in two parts, 90731 and 588, that added together give a palindrome (91319).

The spelling of 90731588 in words is "ninety million, seven hundred thirty-one thousand, five hundred eighty-eight".