90909992 has 8 divisors (see below), whose sum is σ = 170456250. Its totient is φ = 45454992.

The previous prime is 90909991. The next prime is 90910009. The reversal of 90909992 is 29990909.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 56640676 + 34269316 = 7526^2 + 5854^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (90909991) by changing a digit.

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 as a sum of consecutive naturals, namely, 5681867 + ... + 5681882.

Almost surely, 2^90909992 is an apocalyptic number.

It is an amenable number.

90909992 is a deficient number, since it is larger than the sum of its proper divisors (79546258).

90909992 is a wasteful number, since it uses less digits than its factorization.

90909992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11363755 (or 11363751 counting only the distinct ones).

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

The square root of 90909992 is about 9534.6731459448. The cubic root of 90909992 is about 449.6457986425.

The spelling of 90909992 in words is "ninety million, nine hundred nine thousand, nine hundred ninety-two".