687432 has 16 divisors (see below), whose sum is σ = 1718640. Its totient is φ = 229136.

The previous prime is 687431. The next prime is 687433. The reversal of 687432 is 234786.

687432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (687431) and next prime (687433).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 687432.

It is not an unprimeable number, because it can be changed into a prime (687431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14298 + ... + 14345.

It is an arithmetic number, because the mean of its divisors is an integer number (107415).

2⁶⁸⁷⁴³² is an apocalyptic number.

It is an amenable number.

687432 is an abundant number, since it is smaller than the sum of its proper divisors (1031208).

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

687432 is a wasteful number, since it uses less digits than its factorization.

687432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28652 (or 28648 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 687432 is about 829.1151910320. The cubic root of 687432 is about 88.2557984243.

The spelling of 687432 in words is "six hundred eighty-seven thousand, four hundred thirty-two".