687717408 has 48 divisors (see below), whose sum is σ = 2063154240. Its totient is φ = 196490496.

The previous prime is 687717377. The next prime is 687717461. The reversal of 687717408 is 804717786.

687717408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511023 + ... + 512366.

It is an arithmetic number, because the mean of its divisors is an integer number (42982380).

Almost surely, 2^687717408 is an apocalyptic number.

It is an amenable number.

687717408 is an abundant number, since it is smaller than the sum of its proper divisors (1375436832).

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

687717408 is a wasteful number, since it uses less digits than its factorization.

687717408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023409 (or 1023401 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 48.

The square root of 687717408 is about 26224.3666844406. The cubic root of 687717408 is about 882.6801074776.

The spelling of 687717408 in words is "six hundred eighty-seven million, seven hundred seventeen thousand, four hundred eight".