91604 has 6 divisors (see below), whose sum is σ = 160314. Its totient is φ = 45800.

The previous prime is 91591. The next prime is 91621. The reversal of 91604 is 40619.

91604 is nontrivially palindromic in base 14.

It can be written as a sum of positive squares in only one way, i.e., 91204 + 400 = 302^2 + 20^2 .

It is a congruent number.

It is an unprimeable number.

91604 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11447 + ... + 11454.

It is an arithmetic number, because the mean of its divisors is an integer number (26719).

2⁹¹⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

91604 is a deficient number, since it is larger than the sum of its proper divisors (68710).

91604 is a wasteful number, since it uses less digits than its factorization.

91604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22905 (or 22903 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 91604 is about 302.6615271223. The cubic root of 91604 is about 45.0787099839.

The spelling of 91604 in words is "ninety-one thousand, six hundred four".