744720781 has 16 divisors (see below), whose sum is σ = 897269760. Its totient is φ = 604589040.

The previous prime is 744720763. The next prime is 744720791. The reversal of 744720781 is 187027447.

It is a cyclic number.

It is not a de Polignac number, because 744720781 - 2⁷ = 744720653 is a prime.

It is a super-2 number, since 2×744720781² = 1109218083306499922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (744720791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26311 + ... + 46708.

It is an arithmetic number, because the mean of its divisors is an integer number (56079360).

Almost surely, 2^744720781 is an apocalyptic number.

It is an amenable number.

744720781 is a deficient number, since it is larger than the sum of its proper divisors (152548979).

744720781 is a wasteful number, since it uses less digits than its factorization.

744720781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73104.

The product of its (nonzero) digits is 87808, while the sum is 40.

The square root of 744720781 is about 27289.5727522437. The cubic root of 744720781 is about 906.4235021530.

The spelling of 744720781 in words is "seven hundred forty-four million, seven hundred twenty thousand, seven hundred eighty-one".