90990992 has 20 divisors (see below), whose sum is σ = 181060956. Its totient is φ = 44265600.

The previous prime is 90990937. The next prime is 90990997. The reversal of 90990992 is 29909909.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 79995136 + 10995856 = 8944^2 + 3316^2 .

It is not an unprimeable number, because it can be changed into a prime (90990997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76259 + ... + 77442.

Almost surely, 2^90990992 is an apocalyptic number.

It is an amenable number.

90990992 is a deficient number, since it is larger than the sum of its proper divisors (90069964).

90990992 is a wasteful number, since it uses less digits than its factorization.

90990992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153746 (or 153740 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 47.

The square root of 90990992 is about 9538.9198549941. The cubic root of 90990992 is about 449.7793024786.

It can be divided in two parts, 909 and 90992, that multiplied together give a palindrome (82711728).

The spelling of 90990992 in words is "ninety million, nine hundred ninety thousand, nine hundred ninety-two".