6640294144 has 81 divisors (see below), whose sum is σ = 14600695179. Its totient is φ = 3011796480.

The previous prime is 6640294127. The next prime is 6640294151. The reversal of 6640294144 is 4414920466.

The square root of 6640294144 is 81488.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6640294097 and 6640294106.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14341657 + ... + 14342119.

Almost surely, 2^6640294144 is an apocalyptic number.

6640294144 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

6640294144 is the 81488-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6640294144

6640294144 is an abundant number, since it is smaller than the sum of its proper divisors (7960401035).

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

6640294144 is an frugal number, since it uses more digits than its factorization.

6640294144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 40.

The cubic root of 6640294144 is about 1879.5870286512.

The spelling of 6640294144 in words is "six billion, six hundred forty million, two hundred ninety-four thousand, one hundred forty-four".