722735857 has 2 divisors, whose sum is σ = 722735858. Its totient is φ = 722735856.

The previous prime is 722735821. The next prime is 722735917. The reversal of 722735857 is 758537227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 701243361 + 21492496 = 26481^2 + 4636^2 .

It is a cyclic number.

It is not a de Polignac number, because 722735857 - 2⁷ = 722735729 is a prime.

It is not a weakly prime, because it can be changed into another prime (722735257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361367928 + 361367929.

It is an arithmetic number, because the mean of its divisors is an integer number (361367929).

Almost surely, 2^722735857 is an apocalyptic number.

It is an amenable number.

722735857 is a deficient number, since it is larger than the sum of its proper divisors (1).

722735857 is an equidigital number, since it uses as much as digits as its factorization.

722735857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 823200, while the sum is 46.

The square root of 722735857 is about 26883.7470788579. The cubic root of 722735857 is about 897.4147443218.

The spelling of 722735857 in words is "seven hundred twenty-two million, seven hundred thirty-five thousand, eight hundred fifty-seven".