4491991624 has 64 divisors (see below), whose sum is σ = 8675175600. Its totient is φ = 2179989504.

The previous prime is 4491991619. The next prime is 4491991657. The reversal of 4491991624 is 4261991944.

It can be written as a sum of positive squares in 8 ways, for example, as 496487524 + 3995504100 = 22282^2 + 63210^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13329184 + ... + 13329520.

Almost surely, 2^4491991624 is an apocalyptic number.

It is an amenable number.

4491991624 is a deficient number, since it is larger than the sum of its proper divisors (4183183976).

4491991624 is a wasteful number, since it uses less digits than its factorization.

4491991624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722 (or 718 counting only the distinct ones).

The product of its digits is 559872, while the sum is 49.

The square root of 4491991624 is about 67022.3218338488. The cubic root of 4491991624 is about 1649.9836697496.

The spelling of 4491991624 in words is "four billion, four hundred ninety-one million, nine hundred ninety-one thousand, six hundred twenty-four".