688858172 has 12 divisors (see below), whose sum is σ = 1228247496. Its totient is φ = 337930320.

The previous prime is 688858171. The next prime is 688858213. The reversal of 688858172 is 271858886.

It is a super-2 number, since 2×688858172² = 949051162262363168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688858171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1624454 + ... + 1624877.

It is an arithmetic number, because the mean of its divisors is an integer number (102353958).

Almost surely, 2^688858172 is an apocalyptic number.

It is an amenable number.

688858172 is a deficient number, since it is larger than the sum of its proper divisors (539389324).

688858172 is a wasteful number, since it uses less digits than its factorization.

688858172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3249388 (or 3249386 counting only the distinct ones).

The product of its digits is 1720320, while the sum is 53.

The square root of 688858172 is about 26246.1077495312. The cubic root of 688858172 is about 883.1678918672.

The spelling of 688858172 in words is "six hundred eighty-eight million, eight hundred fifty-eight thousand, one hundred seventy-two".