688931148 has 18 divisors (see below), whose sum is σ = 1607718196. Its totient is φ = 229613408.

The previous prime is 688931129. The next prime is 688931161. The reversal of 688931148 is 841139886.

It is a super-2 number, since 2×688931148² = 949252253369195808, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 688931097 and 688931106.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 87136 + ... + 94712.

Almost surely, 2^688931148 is an apocalyptic number.

It is an amenable number.

688931148 is an abundant number, since it is smaller than the sum of its proper divisors (918787048).

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

688931148 is an frugal number, since it uses more digits than its factorization.

688931148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15161 (or 7582 counting only the distinct ones).

The product of its digits is 331776, while the sum is 48.

The square root of 688931148 is about 26247.4979378988. The cubic root of 688931148 is about 883.1990776695.

Multiplying 688931148 by its sum of digits (48), we get a square (33068695104 = 181848²).

The spelling of 688931148 in words is "six hundred eighty-eight million, nine hundred thirty-one thousand, one hundred forty-eight".