688393836 has 48 divisors (see below), whose sum is σ = 1922015200. Its totient is φ = 211813056.

The previous prime is 688393829. The next prime is 688393877. The reversal of 688393836 is 638393886.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 15 ways as a sum of consecutive naturals, for example, 243751 + ... + 246558.

Almost surely, 2^688393836 is an apocalyptic number.

It is an amenable number.

688393836 is an abundant number, since it is smaller than the sum of its proper divisors (1233621364).

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

688393836 is a wasteful number, since it uses less digits than its factorization.

688393836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490335 (or 490327 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The square root of 688393836 is about 26237.2604515029. The cubic root of 688393836 is about 882.9694093932.

The spelling of 688393836 in words is "six hundred eighty-eight million, three hundred ninety-three thousand, eight hundred thirty-six".