688839240 has 32 divisors (see below), whose sum is σ = 2066518080. Its totient is φ = 183690432.

The previous prime is 688839223. The next prime is 688839253. The reversal of 688839240 is 42938886.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 688839240.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2870044 + ... + 2870283.

It is an arithmetic number, because the mean of its divisors is an integer number (64578690).

Almost surely, 2^688839240 is an apocalyptic number.

688839240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

688839240 is an abundant number, since it is smaller than the sum of its proper divisors (1377678840).

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

688839240 is a wasteful number, since it uses less digits than its factorization.

688839240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5740341 (or 5740337 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The square root of 688839240 is about 26245.7470840515. The cubic root of 688839240 is about 883.1598010446.

The spelling of 688839240 in words is "six hundred eighty-eight million, eight hundred thirty-nine thousand, two hundred forty".