721312726 has 8 divisors (see below), whose sum is σ = 1082598624. Its totient is φ = 360446520.

The previous prime is 721312723. The next prime is 721312727. The reversal of 721312726 is 627213127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721312721) 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, 100590 + ... + 107521.

It is an arithmetic number, because the mean of its divisors is an integer number (135324828).

Almost surely, 2^721312726 is an apocalyptic number.

721312726 is a deficient number, since it is larger than the sum of its proper divisors (361285898).

721312726 is a wasteful number, since it uses less digits than its factorization.

721312726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209846.

The product of its digits is 7056, while the sum is 31.

The square root of 721312726 is about 26857.2657953113. The cubic root of 721312726 is about 896.8253275407.

The spelling of 721312726 in words is "seven hundred twenty-one million, three hundred twelve thousand, seven hundred twenty-six".