690908904 has 96 divisors (see below), whose sum is σ = 2207562240. Its totient is φ = 191030400.

The previous prime is 690908903. The next prime is 690908909. The reversal of 690908904 is 409809096.

It is a super-2 number, since 2×690908904² = 954710227252962432, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 690908904.

It is not an unprimeable number, because it can be changed into a prime (690908903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6487 + ... + 37734.

It is an arithmetic number, because the mean of its divisors is an integer number (22995440).

Almost surely, 2^690908904 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 690908904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1103781120).

690908904 is an abundant number, since it is smaller than the sum of its proper divisors (1516653336).

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

690908904 is a wasteful number, since it uses less digits than its factorization.

690908904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44271 (or 44264 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 690908904 is about 26285.1460714983. The cubic root of 690908904 is about 884.0434210840.

The spelling of 690908904 in words is "six hundred ninety million, nine hundred eight thousand, nine hundred four".