721744023 has 32 divisors (see below), whose sum is σ = 1292078592. Its totient is φ = 346089600.

The previous prime is 721744021. The next prime is 721744031. The reversal of 721744023 is 320447127.

It is not a de Polignac number, because 721744023 - 2¹ = 721744021 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721744021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117168 + ... + 123173.

It is an arithmetic number, because the mean of its divisors is an integer number (40377456).

Almost surely, 2^721744023 is an apocalyptic number.

721744023 is a deficient number, since it is larger than the sum of its proper divisors (570334569).

721744023 is a wasteful number, since it uses less digits than its factorization.

721744023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240375.

The product of its (nonzero) digits is 9408, while the sum is 30.

The square root of 721744023 is about 26865.2940240750. The cubic root of 721744023 is about 897.0040392108.

The spelling of 721744023 in words is "seven hundred twenty-one million, seven hundred forty-four thousand, twenty-three".