687447864 has 64 divisors (see below), whose sum is σ = 1961210400. Its totient is φ = 222953472.

The previous prime is 687447833. The next prime is 687447869. The reversal of 687447864 is 468744786.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 687447864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687447869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35017 + ... + 51000.

Almost surely, 2^687447864 is an apocalyptic number.

It is an amenable number.

687447864 is an abundant number, since it is smaller than the sum of its proper divisors (1273762536).

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

687447864 is a wasteful number, since it uses less digits than its factorization.

687447864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86069 (or 86059 counting only the distinct ones).

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

The square root of 687447864 is about 26219.2269908935. The cubic root of 687447864 is about 882.5647731777.

The spelling of 687447864 in words is "six hundred eighty-seven million, four hundred forty-seven thousand, eight hundred sixty-four".