726643693 has 2 divisors, whose sum is σ = 726643694. Its totient is φ = 726643692.

The previous prime is 726643681. The next prime is 726643711. The reversal of 726643693 is 396346627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 724578724 + 2064969 = 26918^2 + 1437^2 .

It is a cyclic number.

It is not a de Polignac number, because 726643693 - 2⁵ = 726643661 is a prime.

It is a super-2 number, since 2×726643693² = 1056022113153356498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (726643993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363321846 + 363321847.

It is an arithmetic number, because the mean of its divisors is an integer number (363321847).

Almost surely, 2^726643693 is an apocalyptic number.

It is an amenable number.

726643693 is a deficient number, since it is larger than the sum of its proper divisors (1).

726643693 is an equidigital number, since it uses as much as digits as its factorization.

726643693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 46.

The square root of 726643693 is about 26956.3293680724. The cubic root of 726643693 is about 899.0292797162.

The spelling of 726643693 in words is "seven hundred twenty-six million, six hundred forty-three thousand, six hundred ninety-three".