772272721 has 4 divisors (see below), whose sum is σ = 842479344. Its totient is φ = 702066100.

The previous prime is 772272703. The next prime is 772272737. The reversal of 772272721 is 127272277.

772272721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 772272721 - 2¹⁵ = 772239953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (772272791) 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, 35103295 + ... + 35103316.

It is an arithmetic number, because the mean of its divisors is an integer number (210619836).

Almost surely, 2^772272721 is an apocalyptic number.

It is an amenable number.

772272721 is a deficient number, since it is larger than the sum of its proper divisors (70206623).

772272721 is a wasteful number, since it uses less digits than its factorization.

772272721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70206622.

The product of its digits is 38416, while the sum is 37.

The square root of 772272721 is about 27789.7952673279. The cubic root of 772272721 is about 917.4665336857.

The spelling of 772272721 in words is "seven hundred seventy-two million, two hundred seventy-two thousand, seven hundred twenty-one".