687478464 has 84 divisors (see below), whose sum is σ = 2056247856. Its totient is φ = 219191808.

The previous prime is 687478457. The next prime is 687478471. The reversal of 687478464 is 464874786.

It is an interprime number because it is at equal distance from previous prime (687478457) and next prime (687478471).

It is a self number, because there is not a number n which added to its sum of digits gives 687478464.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12699 + ... + 39194.

Almost surely, 2^687478464 is an apocalyptic number.

687478464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

687478464 is an abundant number, since it is smaller than the sum of its proper divisors (1368769392).

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

687478464 is a wasteful number, since it uses less digits than its factorization.

687478464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51934 (or 51921 counting only the distinct ones).

The product of its digits is 7225344, while the sum is 54.

The square root of 687478464 is about 26219.8105256312. The cubic root of 687478464 is about 882.5778680284.

The spelling of 687478464 in words is "six hundred eighty-seven million, four hundred seventy-eight thousand, four hundred sixty-four".