687649392 has 160 divisors (see below), whose sum is σ = 2062368000. Its totient is φ = 219098880.

The previous prime is 687649381. The next prime is 687649427. The reversal of 687649392 is 293946786.

It is a happy number.

687649392 is a `hidden beast` number, since 68 + 7 + 6 + 493 + 92 = 666.

687649392 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1640959 + ... + 1641377.

It is an arithmetic number, because the mean of its divisors is an integer number (12889800).

Almost surely, 2^687649392 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 687649392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1031184000).

687649392 is an abundant number, since it is smaller than the sum of its proper divisors (1374718608).

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

687649392 is a wasteful number, since it uses less digits than its factorization.

687649392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596 (or 584 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 687649392 is about 26223.0698431743. The cubic root of 687649392 is about 882.6510071772.

The spelling of 687649392 in words is "six hundred eighty-seven million, six hundred forty-nine thousand, three hundred ninety-two".