726734557 has 2 divisors, whose sum is σ = 726734558. Its totient is φ = 726734556.

The previous prime is 726734551. The next prime is 726734579. The reversal of 726734557 is 755437627.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 698069241 + 28665316 = 26421^2 + 5354^2 .

It is a cyclic number.

It is not a de Polignac number, because 726734557 - 2²³ = 718345949 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 (726734551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363367278 + 363367279.

It is an arithmetic number, because the mean of its divisors is an integer number (363367279).

Almost surely, 2^726734557 is an apocalyptic number.

It is an amenable number.

726734557 is a deficient number, since it is larger than the sum of its proper divisors (1).

726734557 is an equidigital number, since it uses as much as digits as its factorization.

726734557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1234800, while the sum is 46.

The square root of 726734557 is about 26958.0147080604. The cubic root of 726734557 is about 899.0667515393.

The spelling of 726734557 in words is "seven hundred twenty-six million, seven hundred thirty-four thousand, five hundred fifty-seven".