690688881688 has 32 divisors (see below), whose sum is σ = 1397988874800. Its totient is φ = 318018653568.

The previous prime is 690688881677. The next prime is 690688881703. The reversal of 690688881688 is 886188886096.

It is a super-2 number, since 2×690688881688² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7881531 + ... + 7968682.

Almost surely, 2^690688881688 is an apocalyptic number.

It is an amenable number.

690688881688 is an abundant number, since it is smaller than the sum of its proper divisors (707299993112).

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

690688881688 is a wasteful number, since it uses less digits than its factorization.

690688881688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15850651 (or 15850647 counting only the distinct ones).

The product of its (nonzero) digits is 509607936, while the sum is 76.

The spelling of 690688881688 in words is "six hundred ninety billion, six hundred eighty-eight million, eight hundred eighty-one thousand, six hundred eighty-eight".