724820 has 12 divisors (see below), whose sum is σ = 1522164. Its totient is φ = 289920.

The previous prime is 724813. The next prime is 724837. The reversal of 724820 is 28427.

724820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 91204 + 633616 = 302^2 + 796^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18101 + ... + 18140.

It is an arithmetic number, because the mean of its divisors is an integer number (126847).

2⁷²⁴⁸²⁰ is an apocalyptic number.

It is an amenable number.

724820 is an abundant number, since it is smaller than the sum of its proper divisors (797344).

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

724820 is a wasteful number, since it uses less digits than its factorization.

724820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36250 (or 36248 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 724820 is about 851.3636120953. The cubic root of 724820 is about 89.8276537137.

The spelling of 724820 in words is "seven hundred twenty-four thousand, eight hundred twenty".