8621604 has 18 divisors (see below), whose sum is σ = 21793590. Its totient is φ = 2873856.

The previous prime is 8621581. The next prime is 8621609. The reversal of 8621604 is 4061268.

It can be written as a sum of positive squares in only one way, i.e., 7617600 + 1004004 = 2760^2 + 1002^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (8621609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119709 + ... + 119780.

It is an arithmetic number, because the mean of its divisors is an integer number (1210755).

Almost surely, 2^8621604 is an apocalyptic number.

It is an amenable number.

8621604 is an abundant number, since it is smaller than the sum of its proper divisors (13171986).

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

8621604 is a wasteful number, since it uses less digits than its factorization.

8621604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239499 (or 239494 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 8621604 is about 2936.2568007584. The cubic root of 8621604 is about 205.0513771684.

The spelling of 8621604 in words is "eight million, six hundred twenty-one thousand, six hundred four".