687397732 has 48 divisors (see below), whose sum is σ = 1456215040. Its totient is φ = 277346592.

The previous prime is 687397721. The next prime is 687397747. The reversal of 687397732 is 237793786.

It is a self number, because there is not a number n which added to its sum of digits gives 687397732.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82753 + ... + 90679.

Almost surely, 2^687397732 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687397732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (728107520).

687397732 is an abundant number, since it is smaller than the sum of its proper divisors (768817308).

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

687397732 is a wasteful number, since it uses less digits than its factorization.

687397732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8120 (or 8118 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 52.

The square root of 687397732 is about 26218.2709574831. The cubic root of 687397732 is about 882.5433190355.

The spelling of 687397732 in words is "six hundred eighty-seven million, three hundred ninety-seven thousand, seven hundred thirty-two".