724336381 has 4 divisors (see below), whose sum is σ = 742003164. Its totient is φ = 706669600.

The previous prime is 724336351. The next prime is 724336423. The reversal of 724336381 is 183633427.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 311840281 + 412496100 = 17659^2 + 20310^2 .

It is a cyclic number.

It is not a de Polignac number, because 724336381 - 2⁹ = 724335869 is a prime.

It is a super-2 number, since 2×724336381² = 1049326385680354322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 724336381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724336321) 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, 8833330 + ... + 8833411.

It is an arithmetic number, because the mean of its divisors is an integer number (185500791).

Almost surely, 2^724336381 is an apocalyptic number.

It is an amenable number.

724336381 is a deficient number, since it is larger than the sum of its proper divisors (17666783).

724336381 is a wasteful number, since it uses less digits than its factorization.

724336381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17666782.

The product of its digits is 72576, while the sum is 37.

The square root of 724336381 is about 26913.4981189737. The cubic root of 724336381 is about 898.0767080966.

The spelling of 724336381 in words is "seven hundred twenty-four million, three hundred thirty-six thousand, three hundred eighty-one".