687872420 has 12 divisors (see below), whose sum is σ = 1444532124. Its totient is φ = 275148960.

The previous prime is 687872413. The next prime is 687872443. The reversal of 687872420 is 24278786.

It can be written as a sum of positive squares in 2 ways, for example, as 103876864 + 583995556 = 10192^2 + 24166^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17196791 + ... + 17196830.

It is an arithmetic number, because the mean of its divisors is an integer number (120377677).

Almost surely, 2^687872420 is an apocalyptic number.

It is an amenable number.

687872420 is an abundant number, since it is smaller than the sum of its proper divisors (756659704).

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

687872420 is a wasteful number, since it uses less digits than its factorization.

687872420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34393630 (or 34393628 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 44.

The square root of 687872420 is about 26227.3220135034. The cubic root of 687872420 is about 882.7464214065.

The spelling of 687872420 in words is "six hundred eighty-seven million, eight hundred seventy-two thousand, four hundred twenty".