724681 has 4 divisors (see below), whose sum is σ = 749700. Its totient is φ = 699664.

The previous prime is 724651. The next prime is 724721. The reversal of 724681 is 186427.

724681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186427 = 41 ⋅4547.

It can be written as a sum of positive squares in 2 ways, for example, as 608400 + 116281 = 780^2 + 341^2 .

It is a cyclic number.

It is not a de Polignac number, because 724681 - 2⁷ = 724553 is a prime.

It is a super-2 number, since 2×724681² = 1050325103522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (724601) 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, 12466 + ... + 12523.

It is an arithmetic number, because the mean of its divisors is an integer number (187425).

2⁷²⁴⁶⁸¹ is an apocalyptic number.

It is an amenable number.

724681 is a deficient number, since it is larger than the sum of its proper divisors (25019).

724681 is a wasteful number, since it uses less digits than its factorization.

724681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25018.

The product of its digits is 2688, while the sum is 28.

The square root of 724681 is about 851.2819744362. The cubic root of 724681 is about 89.8219112112.

It can be divided in two parts, 72 and 4681, that added together give a triangular number (4753 = T₉₇).

The spelling of 724681 in words is "seven hundred twenty-four thousand, six hundred eighty-one".