720740791 has 2 divisors, whose sum is σ = 720740792. Its totient is φ = 720740790.

The previous prime is 720740773. The next prime is 720740819. The reversal of 720740791 is 197047027.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 720740791 - 2¹¹ = 720738743 is a prime.

It is a super-2 number, since 2×720740791² = 1038934575622611362, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 720740791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720740711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360370395 + 360370396.

It is an arithmetic number, because the mean of its divisors is an integer number (360370396).

Almost surely, 2^720740791 is an apocalyptic number.

720740791 is a deficient number, since it is larger than the sum of its proper divisors (1).

720740791 is an equidigital number, since it uses as much as digits as its factorization.

720740791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24696, while the sum is 37.

The square root of 720740791 is about 26846.6160064914. The cubic root of 720740791 is about 896.5882313859.

The spelling of 720740791 in words is "seven hundred twenty million, seven hundred forty thousand, seven hundred ninety-one".