90591970 has 32 divisors (see below), whose sum is σ = 190700928. Its totient is φ = 30336768.

The previous prime is 90591961. The next prime is 90592037. The reversal of 90591970 is 7919509.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 15 ways as a sum of consecutive naturals, for example, 12039 + ... + 18058.

It is an arithmetic number, because the mean of its divisors is an integer number (5959404).

Almost surely, 2^90591970 is an apocalyptic number.

90591970 is the 6020-th heptagonal number.

90591970 is an abundant number, since it is smaller than the sum of its proper divisors (100108958).

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

90591970 is a wasteful number, since it uses less digits than its factorization.

90591970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30154.

The product of its (nonzero) digits is 25515, while the sum is 40.

The square root of 90591970 is about 9517.9814036381. The cubic root of 90591970 is about 449.1208679848.

The spelling of 90591970 in words is "ninety million, five hundred ninety-one thousand, nine hundred seventy".