726781619 has 2 divisors, whose sum is σ = 726781620. Its totient is φ = 726781618.

The previous prime is 726781567. The next prime is 726781661. The reversal of 726781619 is 916187627.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726781619 is a prime.

It is a super-2 number, since 2×726781619² = 1056423043432522322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (726781819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363390809 + 363390810.

It is an arithmetic number, because the mean of its divisors is an integer number (363390810).

Almost surely, 2^726781619 is an apocalyptic number.

726781619 is a deficient number, since it is larger than the sum of its proper divisors (1).

726781619 is an equidigital number, since it uses as much as digits as its factorization.

726781619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 47.

The square root of 726781619 is about 26958.8875697793. The cubic root of 726781619 is about 899.0861584263.

The spelling of 726781619 in words is "seven hundred twenty-six million, seven hundred eighty-one thousand, six hundred nineteen".