687563440 has 40 divisors (see below), whose sum is σ = 1637582688. Its totient is φ = 268316160.

The previous prime is 687563411. The next prime is 687563441. The reversal of 687563440 is 44365786.

687563440 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 (40).

It is not an unprimeable number, because it can be changed into a prime (687563441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101532 + ... + 108091.

Almost surely, 2^687563440 is an apocalyptic number.

It is an amenable number.

687563440 is an abundant number, since it is smaller than the sum of its proper divisors (950019248).

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

687563440 is a wasteful number, since it uses less digits than its factorization.

687563440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209677 (or 209671 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 43.

The square root of 687563440 is about 26221.4309296804. The cubic root of 687563440 is about 882.6142303054.

The spelling of 687563440 in words is "six hundred eighty-seven million, five hundred sixty-three thousand, four hundred forty".