687124920 has 64 divisors (see below), whose sum is σ = 2127882240. Its totient is φ = 177321600.

The previous prime is 687124903. The next prime is 687124939. The reversal of 687124920 is 29421786.

687124920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88636 + ... + 96075.

It is an arithmetic number, because the mean of its divisors is an integer number (33248160).

Almost surely, 2^687124920 is an apocalyptic number.

687124920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

687124920 is an abundant number, since it is smaller than the sum of its proper divisors (1440757320).

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

687124920 is a wasteful number, since it uses less digits than its factorization.

687124920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184756 (or 184752 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 687124920 is about 26213.0677334798. The cubic root of 687124920 is about 882.4265500212.

The spelling of 687124920 in words is "six hundred eighty-seven million, one hundred twenty-four thousand, nine hundred twenty".