7964442621 has 12 divisors (see below), whose sum is σ = 11504979772. Its totient is φ = 5309266176.

The previous prime is 7964442617. The next prime is 7964442623. The reversal of 7964442621 is 1262444697.

It can be written as a sum of positive squares in 2 ways, for example, as 2887880121 + 5076562500 = 53739^2 + 71250^2 .

It is not a de Polignac number, because 7964442621 - 2² = 7964442617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7964442623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 207855 + ... + 243171.

Almost surely, 2^7964442621 is an apocalyptic number.

It is an amenable number.

7964442621 is a deficient number, since it is larger than the sum of its proper divisors (3540537151).

7964442621 is a wasteful number, since it uses less digits than its factorization.

7964442621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60380 (or 60377 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 7964442621 is about 89243.7259475421. The cubic root of 7964442621 is about 1997.0324841860.

It can be divided in two parts, 79644 and 42621, that added together give a triangular number (122265 = T₄₉₄).

The spelling of 7964442621 in words is "seven billion, nine hundred sixty-four million, four hundred forty-two thousand, six hundred twenty-one".