687840732 has 36 divisors (see below), whose sum is σ = 1745343600. Its totient is φ = 228405312.

The previous prime is 687840701. The next prime is 687840733. The reversal of 687840732 is 237048786.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687840733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26857 + ... + 45792.

Almost surely, 2^687840732 is an apocalyptic number.

It is an amenable number.

687840732 is an abundant number, since it is smaller than the sum of its proper divisors (1057502868).

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

687840732 is a wasteful number, since it uses less digits than its factorization.

687840732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72922 (or 72917 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The square root of 687840732 is about 26226.7179036951. The cubic root of 687840732 is about 882.7328661321.

The spelling of 687840732 in words is "six hundred eighty-seven million, eight hundred forty thousand, seven hundred thirty-two".