90991012 has 12 divisors (see below), whose sum is σ = 181982080. Its totient is φ = 38996136.

The previous prime is 90990997. The next prime is 90991027. The reversal of 90991012 is 21019909.

It is an interprime number because it is at equal distance from previous prime (90990997) and next prime (90991027).

90991012 is an admirable 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, 1624812 + ... + 1624867.

Almost surely, 2^90991012 is an apocalyptic number.

It is an amenable number.

90991012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

90991012 is a wasteful number, since it uses less digits than its factorization.

90991012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3249690 (or 3249688 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 90991012 is about 9538.9209033307. The cubic root of 90991012 is about 449.7793354327.

The spelling of 90991012 in words is "ninety million, nine hundred ninety-one thousand, twelve".