8131604508 has 36 divisors (see below), whose sum is σ = 20571460000. Its totient is φ = 2708349696.

The previous prime is 8131604501. The next prime is 8131604549. The reversal of 8131604508 is 8054061318.

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

It is a super-2 number, since 2×8131604508² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8131604501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45460 + ... + 135387.

Almost surely, 2^8131604508 is an apocalyptic number.

It is an amenable number.

8131604508 is an abundant number, since it is smaller than the sum of its proper divisors (12439855492).

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

8131604508 is a wasteful number, since it uses less digits than its factorization.

8131604508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182106 (or 182101 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 8131604508 is about 90175.4096636106. The cubic root of 8131604508 is about 2010.9074479821.

The spelling of 8131604508 in words is "eight billion, one hundred thirty-one million, six hundred four thousand, five hundred eight".