91004404 has 12 divisors (see below), whose sum is σ = 159487300. Its totient is φ = 45436608.

The previous prime is 91004393. The next prime is 91004411. The reversal of 91004404 is 40440019.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5071504 + 85932900 = 2252^2 + 9270^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13209 + ... + 18880.

Almost surely, 2^91004404 is an apocalyptic number.

It is an amenable number.

91004404 is a deficient number, since it is larger than the sum of its proper divisors (68482896).

91004404 is a wasteful number, since it uses less digits than its factorization.

91004404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32802 (or 32800 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 91004404 is about 9539.6228436978. The cubic root of 91004404 is about 449.8014004303.

The spelling of 91004404 in words is "ninety-one million, four thousand, four hundred four".