749269781 has 54 divisors (see below), whose sum is σ = 932042790. Its totient is φ = 601176576.

The previous prime is 749269757. The next prime is 749269819. The reversal of 749269781 is 187962947.

749269781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 9 ways, for example, as 157126225 + 592143556 = 12535^2 + 24334^2 .

It is a de Polignac number, because none of the positive numbers 2^k-749269781 is a prime.

It is a super-2 number, since 2×749269781² = 1122810409439575922, 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 (749269481) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 25836875 + ... + 25836903.

Almost surely, 2^749269781 is an apocalyptic number.

It is an amenable number.

749269781 is a deficient number, since it is larger than the sum of its proper divisors (182773009).

749269781 is a wasteful number, since it uses less digits than its factorization.

749269781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 82 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 53.

The square root of 749269781 is about 27372.7927146647. The cubic root of 749269781 is about 908.2653348942.

The spelling of 749269781 in words is "seven hundred forty-nine million, two hundred sixty-nine thousand, seven hundred eighty-one".