720263721 has 4 divisors (see below), whose sum is σ = 960351632. Its totient is φ = 480175812.

The previous prime is 720263683. The next prime is 720263729. The reversal of 720263721 is 127362027.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 720263721 - 2⁶ = 720263657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (720263729) 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, 120043951 + ... + 120043956.

It is an arithmetic number, because the mean of its divisors is an integer number (240087908).

Almost surely, 2^720263721 is an apocalyptic number.

It is an amenable number.

720263721 is a deficient number, since it is larger than the sum of its proper divisors (240087911).

720263721 is a wasteful number, since it uses less digits than its factorization.

720263721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240087910.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 720263721 is about 26837.7294307846. The cubic root of 720263721 is about 896.3903656333.

The spelling of 720263721 in words is "seven hundred twenty million, two hundred sixty-three thousand, seven hundred twenty-one".