631724 has 6 divisors (see below), whose sum is σ = 1105524. Its totient is φ = 315860.

The previous prime is 631723. The next prime is 631733. The reversal of 631724 is 427136.

631724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 631724.

It is not an unprimeable number, because it can be changed into a prime (631723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78962 + ... + 78969.

It is an arithmetic number, because the mean of its divisors is an integer number (184254).

2⁶³¹⁷²⁴ is an apocalyptic number.

It is an amenable number.

631724 is a deficient number, since it is larger than the sum of its proper divisors (473800).

631724 is a wasteful number, since it uses less digits than its factorization.

631724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157935 (or 157933 counting only the distinct ones).

The product of its digits is 1008, while the sum is 23.

The square root of 631724 is about 794.8106692792. The cubic root of 631724 is about 85.8043144013.

The spelling of 631724 in words is "six hundred thirty-one thousand, seven hundred twenty-four".