904430640 has 80 divisors (see below), whose sum is σ = 2831033088. Its totient is φ = 238833408.

The previous prime is 904430629. The next prime is 904430641. The reversal of 904430640 is 46034409.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 904430598 and 904430607.

It is not an unprimeable number, because it can be changed into a prime (904430641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6427 + ... + 43013.

Almost surely, 2^904430640 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 904430640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1415516544).

904430640 is an abundant number, since it is smaller than the sum of its proper divisors (1926602448).

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

904430640 is a wasteful number, since it uses less digits than its factorization.

904430640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36706 (or 36700 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 904430640 is about 30073.7533407455. The cubic root of 904430640 is about 967.0711384402.

The spelling of 904430640 in words is "nine hundred four million, four hundred thirty thousand, six hundred forty".