690639764 has 12 divisors (see below), whose sum is σ = 1210305600. Its totient is φ = 344838168.

The previous prime is 690639757. The next prime is 690639827. The reversal of 690639764 is 467936096.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117194 + ... + 122945.

It is an arithmetic number, because the mean of its divisors is an integer number (100858800).

Almost surely, 2^690639764 is an apocalyptic number.

It is an amenable number.

690639764 is a deficient number, since it is larger than the sum of its proper divisors (519665836).

690639764 is a wasteful number, since it uses less digits than its factorization.

690639764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240862 (or 240860 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 50.

The square root of 690639764 is about 26280.0259512809. The cubic root of 690639764 is about 883.9286146570.

The spelling of 690639764 in words is "six hundred ninety million, six hundred thirty-nine thousand, seven hundred sixty-four".