724280731 has 4 divisors (see below), whose sum is σ = 728282464. Its totient is φ = 720279000.

The previous prime is 724280723. The next prime is 724280743. The reversal of 724280731 is 137082427.

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

It is a cyclic number.

It is not a de Polignac number, because 724280731 - 2³ = 724280723 is a prime.

It is a super-2 number, since 2×724280731² = 1049165154595788722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721280731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000595 + ... + 2000956.

It is an arithmetic number, because the mean of its divisors is an integer number (182070616).

Almost surely, 2^724280731 is an apocalyptic number.

724280731 is a deficient number, since it is larger than the sum of its proper divisors (4001733).

724280731 is a wasteful number, since it uses less digits than its factorization.

724280731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4001732.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 724280731 is about 26912.4642312814. The cubic root of 724280731 is about 898.0537080788.

The spelling of 724280731 in words is "seven hundred twenty-four million, two hundred eighty thousand, seven hundred thirty-one".