772708721 has 2 divisors, whose sum is σ = 772708722. Its totient is φ = 772708720.

The previous prime is 772708711. The next prime is 772708747. The reversal of 772708721 is 127807277.

772708721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395572321 + 377136400 = 19889^2 + 19420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-772708721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (772708711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 386354360 + 386354361.

It is an arithmetic number, because the mean of its divisors is an integer number (386354361).

Almost surely, 2^772708721 is an apocalyptic number.

It is an amenable number.

772708721 is a deficient number, since it is larger than the sum of its proper divisors (1).

772708721 is an equidigital number, since it uses as much as digits as its factorization.

772708721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76832, while the sum is 41.

The square root of 772708721 is about 27797.6387666291. The cubic root of 772708721 is about 917.6391584346.

The spelling of 772708721 in words is "seven hundred seventy-two million, seven hundred eight thousand, seven hundred twenty-one".