90991204 has 6 divisors (see below), whose sum is σ = 159234614. Its totient is φ = 45495600.

The previous prime is 90991193. The next prime is 90991213. The reversal of 90991204 is 40219909.

It can be written as a sum of positive squares in only one way, i.e., 53144100 + 37847104 = 7290^2 + 6152^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 90991204.

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 as a sum of consecutive naturals, namely, 11373897 + ... + 11373904.

Almost surely, 2^90991204 is an apocalyptic number.

It is an amenable number.

90991204 is a deficient number, since it is larger than the sum of its proper divisors (68243410).

90991204 is a wasteful number, since it uses less digits than its factorization.

90991204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22747805 (or 22747803 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 90991204 is about 9538.9309673569. The cubic root of 90991204 is about 449.7796517921.

The spelling of 90991204 in words is "ninety million, nine hundred ninety-one thousand, two hundred four".