6644042408 has 32 divisors (see below), whose sum is σ = 13406630760. Its totient is φ = 3075348480.

The previous prime is 6644042401. The next prime is 6644042441. The reversal of 6644042408 is 8042404466.

It can be written as a sum of positive squares in 4 ways, for example, as 2509809604 + 4134232804 = 50098^2 + 64298^2 .

It is not an unprimeable number, because it can be changed into a prime (6644042401) 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, 392141 + ... + 408732.

Almost surely, 2^6644042408 is an apocalyptic number.

6644042408 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

6644042408 is an abundant number, since it is smaller than the sum of its proper divisors (6762588352).

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

6644042408 is a wasteful number, since it uses less digits than its factorization.

6644042408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800957 (or 800953 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 38.

The square root of 6644042408 is about 81510.9956263571. The cubic root of 6644042408 is about 1879.9406205781.

The spelling of 6644042408 in words is "six billion, six hundred forty-four million, forty-two thousand, four hundred eight".