744256781 has 2 divisors, whose sum is σ = 744256782. Its totient is φ = 744256780.

The previous prime is 744256757. The next prime is 744256789. The reversal of 744256781 is 187652447.

744256781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544288900 + 199967881 = 23330^2 + 14141^2 .

It is a cyclic number.

It is not a de Polignac number, because 744256781 - 2⁶ = 744256717 is a prime.

It is a super-2 number, since 2×744256781² = 1107836312128963922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (744256789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372128390 + 372128391.

It is an arithmetic number, because the mean of its divisors is an integer number (372128391).

Almost surely, 2^744256781 is an apocalyptic number.

It is an amenable number.

744256781 is a deficient number, since it is larger than the sum of its proper divisors (1).

744256781 is an equidigital number, since it uses as much as digits as its factorization.

744256781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 376320, while the sum is 44.

The square root of 744256781 is about 27281.0700120065. The cubic root of 744256781 is about 906.2352132918.

The spelling of 744256781 in words is "seven hundred forty-four million, two hundred fifty-six thousand, seven hundred eighty-one".