720979791 has 16 divisors (see below), whose sum is σ = 1099171584. Its totient is φ = 411787584.

The previous prime is 720979789. The next prime is 720979799. The reversal of 720979791 is 197979027.

It is not a de Polignac number, because 720979791 - 2¹ = 720979789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720979799) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43080 + ... + 57426.

It is an arithmetic number, because the mean of its divisors is an integer number (68698224).

Almost surely, 2^720979791 is an apocalyptic number.

720979791 is a deficient number, since it is larger than the sum of its proper divisors (378191793).

720979791 is a wasteful number, since it uses less digits than its factorization.

720979791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16750.

The product of its (nonzero) digits is 500094, while the sum is 51.

The square root of 720979791 is about 26851.0668503134. The cubic root of 720979791 is about 896.6873242954.

The spelling of 720979791 in words is "seven hundred twenty million, nine hundred seventy-nine thousand, seven hundred ninety-one".