687717456 has 40 divisors (see below), whose sum is σ = 1881111744. Its totient is φ = 215754240.

The previous prime is 687717377. The next prime is 687717461. The reversal of 687717456 is 654717786.

It is a super-2 number, since 2×687717456² = 945910598574223872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 687717399 and 687717408.

It is a congruent number.

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, 420580 + ... + 422211.

Almost surely, 2^687717456 is an apocalyptic number.

It is an amenable number.

687717456 is an abundant number, since it is smaller than the sum of its proper divisors (1193394288).

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

687717456 is a wasteful number, since it uses less digits than its factorization.

687717456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842819 (or 842813 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 51.

The square root of 687717456 is about 26224.3675996200. The cubic root of 687717456 is about 882.6801280135.

The spelling of 687717456 in words is "six hundred eighty-seven million, seven hundred seventeen thousand, four hundred fifty-six".