688832540 has 24 divisors (see below), whose sum is σ = 1578053232. Its totient is φ = 250484480.

The previous prime is 688832539. The next prime is 688832567. The reversal of 688832540 is 45238886.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 688832491 and 688832500.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1565309 + ... + 1565748.

It is an arithmetic number, because the mean of its divisors is an integer number (65752218).

Almost surely, 2^688832540 is an apocalyptic number.

It is an amenable number.

688832540 is an abundant number, since it is smaller than the sum of its proper divisors (889220692).

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

688832540 is a wasteful number, since it uses less digits than its factorization.

688832540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131077 (or 3131075 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 44.

The square root of 688832540 is about 26245.6194440139. The cubic root of 688832540 is about 883.1569376819.

The spelling of 688832540 in words is "six hundred eighty-eight million, eight hundred thirty-two thousand, five hundred forty".