91604052 has 36 divisors (see below), whose sum is σ = 232479156. Its totient is φ = 30412800.

The previous prime is 91604047. The next prime is 91604057. The reversal of 91604052 is 25040619.

91604052 is a `hidden beast` number, since 9 + 1 + 604 + 0 + 52 = 666.

It is an interprime number because it is at equal distance from previous prime (91604047) and next prime (91604057).

It can be written as a sum of positive squares in 2 ways, for example, as 89189136 + 2414916 = 9444^2 + 1554^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91604057) 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 in 11 ways as a sum of consecutive naturals, for example, 4302 + ... + 14202.

Almost surely, 2^91604052 is an apocalyptic number.

It is an amenable number.

91604052 is an abundant number, since it is smaller than the sum of its proper divisors (140875104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91604052 is a wasteful number, since it uses less digits than its factorization.

91604052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10168 (or 10163 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 91604052 is about 9571.0005746526. Note that the first 3 decimals coincide. The cubic root of 91604052 is about 450.7871851368.

It can be divided in two parts, 9 and 1604052, that added together give a palindrome (1604061).

The spelling of 91604052 in words is "ninety-one million, six hundred four thousand, fifty-two".