904321656 has 144 divisors (see below), whose sum is σ = 2871404640. Its totient is φ = 256354560.

The previous prime is 904321643. The next prime is 904321657. The reversal of 904321656 is 656123409.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 904321656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (904321657) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 482401 + ... + 484271.

It is an arithmetic number, because the mean of its divisors is an integer number (19940310).

Almost surely, 2^904321656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 904321656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1435702320).

904321656 is an abundant number, since it is smaller than the sum of its proper divisors (1967082984).

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

904321656 is a wasteful number, since it uses less digits than its factorization.

904321656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034 (or 2020 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 904321656 is about 30071.9413407249. The cubic root of 904321656 is about 967.0322928173.

The spelling of 904321656 in words is "nine hundred four million, three hundred twenty-one thousand, six hundred fifty-six".