4499860644 has 18 divisors (see below), whose sum is σ = 11374647830. Its totient is φ = 1499953536.

The previous prime is 4499860637. The next prime is 4499860663. The reversal of 4499860644 is 4460689944.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4236447744 + 263412900 = 65088^2 + 16230^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62498029 + ... + 62498100.

Almost surely, 2^4499860644 is an apocalyptic number.

It is an amenable number.

4499860644 is an abundant number, since it is smaller than the sum of its proper divisors (6874787186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4499860644 is a wasteful number, since it uses less digits than its factorization.

4499860644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124996139 (or 124996134 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 54.

The square root of 4499860644 is about 67081.0006186551. Note that the first 3 decimals coincide. The cubic root of 4499860644 is about 1650.9465819242.

The spelling of 4499860644 in words is "four billion, four hundred ninety-nine million, eight hundred sixty thousand, six hundred forty-four".