743657641 has 6 divisors (see below), whose sum is σ = 759819050. Its totient is φ = 727832976.

The previous prime is 743657617. The next prime is 743657657. The reversal of 743657641 is 146756347.

It can be written as a sum of positive squares in only one way, i.e., 705168025 + 38489616 = 26555^2 + 6204^2 .

It is not a de Polignac number, because 743657641 - 2¹¹ = 743655593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (743657611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 166116 + ... + 170533.

Almost surely, 2^743657641 is an apocalyptic number.

It is an amenable number.

743657641 is a deficient number, since it is larger than the sum of its proper divisors (16161409).

743657641 is an equidigital number, since it uses as much as digits as its factorization.

743657641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336743 (or 336696 counting only the distinct ones).

The product of its digits is 423360, while the sum is 43.

The square root of 743657641 is about 27270.0869268875. The cubic root of 743657641 is about 905.9919694981.

The spelling of 743657641 in words is "seven hundred forty-three million, six hundred fifty-seven thousand, six hundred forty-one".