690655688 has 16 divisors (see below), whose sum is σ = 1298592000. Its totient is φ = 344364496.

The previous prime is 690655687. The next prime is 690655697. The reversal of 690655688 is 886556096.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (690655687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117368 + ... + 123111.

It is an arithmetic number, because the mean of its divisors is an integer number (81162000).

Almost surely, 2^690655688 is an apocalyptic number.

It is an amenable number.

690655688 is a deficient number, since it is larger than the sum of its proper divisors (607936312).

690655688 is a wasteful number, since it uses less digits than its factorization.

690655688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240844 (or 240840 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 53.

The square root of 690655688 is about 26280.3289172719. The cubic root of 690655688 is about 883.9354081509.

The spelling of 690655688 in words is "six hundred ninety million, six hundred fifty-five thousand, six hundred eighty-eight".