724636 has 24 divisors (see below), whose sum is σ = 1419264. Its totient is φ = 320880.

The previous prime is 724631. The next prime is 724639. The reversal of 724636 is 636427.

724636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1701 + ... + 2083.

It is an arithmetic number, because the mean of its divisors is an integer number (59136).

2⁷²⁴⁶³⁶ is an apocalyptic number.

It is an amenable number.

724636 is a deficient number, since it is larger than the sum of its proper divisors (694628).

724636 is a wasteful number, since it uses less digits than its factorization.

724636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 439 counting only the distinct ones).

The product of its digits is 6048, while the sum is 28.

The square root of 724636 is about 851.2555433006. The cubic root of 724636 is about 89.8200519703.

Subtracting from 724636 its reverse (636427), we obtain a square (88209 = 297²).

It can be divided in two parts, 72463 and 6, that multiplied together give a triangular number (434778 = T₉₃₂).

The spelling of 724636 in words is "seven hundred twenty-four thousand, six hundred thirty-six".