688513870 has 16 divisors (see below), whose sum is σ = 1351991088. Its totient is φ = 250368640.

The previous prime is 688513781. The next prime is 688513907. The reversal of 688513870 is 78315886.

It is a self number, because there is not a number n which added to its sum of digits gives 688513870.

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, 3129499 + ... + 3129718.

It is an arithmetic number, because the mean of its divisors is an integer number (84499443).

Almost surely, 2^688513870 is an apocalyptic number.

688513870 is a deficient number, since it is larger than the sum of its proper divisors (663477218).

688513870 is a wasteful number, since it uses less digits than its factorization.

688513870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6259235.

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 688513870 is about 26239.5478238479. The cubic root of 688513870 is about 883.0207270087.

The spelling of 688513870 in words is "six hundred eighty-eight million, five hundred thirteen thousand, eight hundred seventy".