687392320 has 56 divisors (see below), whose sum is σ = 1644237504. Its totient is φ = 273716736.

The previous prime is 687392287. The next prime is 687392333. The reversal of 687392320 is 23293786.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 67909 + ... + 77371.

It is an arithmetic number, because the mean of its divisors is an integer number (29361384).

Almost surely, 2^687392320 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 687392320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (822118752).

687392320 is an abundant number, since it is smaller than the sum of its proper divisors (956845184).

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

687392320 is a wasteful number, since it uses less digits than its factorization.

687392320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9707 (or 9697 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 687392320 is about 26218.1677468125. The cubic root of 687392320 is about 882.5410028912.

The spelling of 687392320 in words is "six hundred eighty-seven million, three hundred ninety-two thousand, three hundred twenty".