7644744621 has 12 divisors (see below), whose sum is σ = 11043167772. Its totient is φ = 5096146176.

The previous prime is 7644744619. The next prime is 7644744629. The reversal of 7644744621 is 1264474467.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 961682121 + 6683062500 = 31011^2 + 81750^2 .

It is not a de Polignac number, because 7644744621 - 2¹ = 7644744619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7644744629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 233175 + ... + 263931.

It is an arithmetic number, because the mean of its divisors is an integer number (920263981).

Almost surely, 2^7644744621 is an apocalyptic number.

It is an amenable number.

7644744621 is a deficient number, since it is larger than the sum of its proper divisors (3398423151).

7644744621 is a wasteful number, since it uses less digits than its factorization.

7644744621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58380 (or 58377 counting only the distinct ones).

The product of its digits is 903168, while the sum is 45.

The square root of 7644744621 is about 87434.2302590925. The cubic root of 7644744621 is about 1969.9460265904.

The spelling of 7644744621 in words is "seven billion, six hundred forty-four million, seven hundred forty-four thousand, six hundred twenty-one".