6644512040 has 32 divisors (see below), whose sum is σ = 15737004000. Its totient is φ = 2517920064.

The previous prime is 6644512037. The next prime is 6644512057. The reversal of 6644512040 is 402154466.

It is a junction number, because it is equal to n+sod(n) for n = 6644511988 and 6644512006.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4370630 + ... + 4372149.

It is an arithmetic number, because the mean of its divisors is an integer number (491781375).

Almost surely, 2^6644512040 is an apocalyptic number.

It is an amenable number.

6644512040 is an abundant number, since it is smaller than the sum of its proper divisors (9092491960).

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

6644512040 is a wasteful number, since it uses less digits than its factorization.

6644512040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8742809 (or 8742805 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 6644512040 is about 81513.8763647025. The cubic root of 6644512040 is about 1879.9849138672.

The spelling of 6644512040 in words is "six billion, six hundred forty-four million, five hundred twelve thousand, forty".