726440641 has 2 divisors, whose sum is σ = 726440642. Its totient is φ = 726440640.

The previous prime is 726440597. The next prime is 726440653. The reversal of 726440641 is 146044627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 660490000 + 65950641 = 25700^2 + 8121^2 .

It is a cyclic number.

It is not a de Polignac number, because 726440641 - 2⁷ = 726440513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 726440597 and 726440606.

It is not a weakly prime, because it can be changed into another prime (726440681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363220320 + 363220321.

It is an arithmetic number, because the mean of its divisors is an integer number (363220321).

Almost surely, 2^726440641 is an apocalyptic number.

It is an amenable number.

726440641 is a deficient number, since it is larger than the sum of its proper divisors (1).

726440641 is an equidigital number, since it uses as much as digits as its factorization.

726440641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 726440641 is about 26952.5627909481. The cubic root of 726440641 is about 898.9455308760.

The spelling of 726440641 in words is "seven hundred twenty-six million, four hundred forty thousand, six hundred forty-one".