4438349640 has 80 divisors (see below), whose sum is σ = 14917797180. Its totient is φ = 1183559040.

The previous prime is 4438349623. The next prime is 4438349653. The reversal of 4438349640 is 469438344.

It is a happy number.

4438349640 is a `hidden beast` number, since 4 + 43 + 83 + 496 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4062532644 + 375816996 = 63738^2 + 19386^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 681691 + ... + 688170.

Almost surely, 2^4438349640 is an apocalyptic number.

4438349640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4438349640 is an abundant number, since it is smaller than the sum of its proper divisors (10479447540).

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

4438349640 is a wasteful number, since it uses less digits than its factorization.

4438349640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369884 (or 1369871 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 45.

The square root of 4438349640 is about 66620.9399513396. The cubic root of 4438349640 is about 1643.3894850663.

The spelling of 4438349640 in words is "four billion, four hundred thirty-eight million, three hundred forty-nine thousand, six hundred forty".