91990612 has 24 divisors (see below), whose sum is σ = 184443840. Its totient is φ = 39325440.

The previous prime is 91990607. The next prime is 91990627. The reversal of 91990612 is 21609919.

It is a super-2 number, since 2×91990612² = 16924545392269088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7812 + ... + 15652.

It is an arithmetic number, because the mean of its divisors is an integer number (7685160).

Almost surely, 2^91990612 is an apocalyptic number.

It is an amenable number.

91990612 is an abundant number, since it is smaller than the sum of its proper divisors (92453228).

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

91990612 is a wasteful number, since it uses less digits than its factorization.

91990612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8271 (or 8269 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 91990612 is about 9591.1736508104. The cubic root of 91990612 is about 451.4203876672.

The spelling of 91990612 in words is "ninety-one million, nine hundred ninety thousand, six hundred twelve".