688999012 has 24 divisors (see below), whose sum is σ = 1300925696. Its totient is φ = 317405088.

The previous prime is 688999007. The next prime is 688999027. The reversal of 688999012 is 210999886.

It is a super-2 number, since 2×688999012² = 949439277073952288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16333 + ... + 40555.

Almost surely, 2^688999012 is an apocalyptic number.

It is an amenable number.

688999012 is a deficient number, since it is larger than the sum of its proper divisors (611926684).

688999012 is a wasteful number, since it uses less digits than its factorization.

688999012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24787 (or 24785 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 52.

The square root of 688999012 is about 26248.7906769055. The cubic root of 688999012 is about 883.2280769168.

The spelling of 688999012 in words is "six hundred eighty-eight million, nine hundred ninety-nine thousand, twelve".