726647791 has 2 divisors, whose sum is σ = 726647792. Its totient is φ = 726647790.

The previous prime is 726647783. The next prime is 726647821. The reversal of 726647791 is 197746627.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 726647791 - 2³ = 726647783 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (726647731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363323895 + 363323896.

It is an arithmetic number, because the mean of its divisors is an integer number (363323896).

Almost surely, 2^726647791 is an apocalyptic number.

726647791 is a deficient number, since it is larger than the sum of its proper divisors (1).

726647791 is an equidigital number, since it uses as much as digits as its factorization.

726647791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 49.

The square root of 726647791 is about 26956.4053797980. The cubic root of 726647791 is about 899.0309697766.

The spelling of 726647791 in words is "seven hundred twenty-six million, six hundred forty-seven thousand, seven hundred ninety-one".