688532044 has 12 divisors (see below), whose sum is σ = 1206940168. Its totient is φ = 343692000.

The previous prime is 688532029. The next prime is 688532057. The reversal of 688532044 is 440235886.

It is a super-2 number, since 2×688532044² = 948152751229635872, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 688531988 and 688532006.

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 3 ways as a sum of consecutive naturals, for example, 140802 + ... + 145609.

Almost surely, 2^688532044 is an apocalyptic number.

It is an amenable number.

688532044 is a deficient number, since it is larger than the sum of its proper divisors (518408124).

688532044 is a wasteful number, since it uses less digits than its factorization.

688532044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287016 (or 287014 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 40.

The square root of 688532044 is about 26239.8941308840. The cubic root of 688532044 is about 883.0284963402.

The spelling of 688532044 in words is "six hundred eighty-eight million, five hundred thirty-two thousand, forty-four".