8520904 has 24 divisors (see below), whose sum is σ = 18585990. Its totient is φ = 3651648.

The previous prime is 8520901. The next prime is 8520913. The reversal of 8520904 is 4090258.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 8398404 + 122500 = 2898^2 + 350^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (8520901) 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, 10477 + ... + 11260.

Almost surely, 2^8520904 is an apocalyptic number.

It is an amenable number.

8520904 is an abundant number, since it is smaller than the sum of its proper divisors (10065086).

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

8520904 is a wasteful number, since it uses less digits than its factorization.

8520904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21757 (or 21746 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 8520904 is about 2919.0587524063. The cubic root of 8520904 is about 204.2499179761.

The spelling of 8520904 in words is "eight million, five hundred twenty thousand, nine hundred four".