7974489644 has 24 divisors (see below), whose sum is σ = 15257970000. Its totient is φ = 3616686080.

The previous prime is 7974489637. The next prime is 7974489647. The reversal of 7974489644 is 4469844797.

It is not an unprimeable number, because it can be changed into a prime (7974489647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182069 + ... + 221580.

It is an arithmetic number, because the mean of its divisors is an integer number (635748750).

Almost surely, 2^7974489644 is an apocalyptic number.

It is an amenable number.

7974489644 is a deficient number, since it is larger than the sum of its proper divisors (7283480356).

7974489644 is a wasteful number, since it uses less digits than its factorization.

7974489644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404113 (or 404111 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 62.

The square root of 7974489644 is about 89299.9980067189. The cubic root of 7974489644 is about 1997.8718733416.

The spelling of 7974489644 in words is "seven billion, nine hundred seventy-four million, four hundred eighty-nine thousand, six hundred forty-four".