688570389 has 72 divisors (see below), whose sum is σ = 1167042240. Its totient is φ = 405312336.

The previous prime is 688570387. The next prime is 688570409. The reversal of 688570389 is 983075886.

It is a happy number.

688570389 is a `hidden beast` number, since 68 + 8 + 570 + 3 + 8 + 9 = 666.

It is not a de Polignac number, because 688570389 - 2¹ = 688570387 is a prime.

It is a super-2 number, since 2×688570389² = 948258361215222642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688570387) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 29937832 + ... + 29937854.

It is an arithmetic number, because the mean of its divisors is an integer number (16208920).

Almost surely, 2^688570389 is an apocalyptic number.

688570389 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

688570389 is a deficient number, since it is larger than the sum of its proper divisors (478471851).

688570389 is an frugal number, since it uses more digits than its factorization.

688570389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82 (or 39 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The square root of 688570389 is about 26240.6247829582. The cubic root of 688570389 is about 883.0448882663.

The spelling of 688570389 in words is "six hundred eighty-eight million, five hundred seventy thousand, three hundred eighty-nine".