2644041640 has 16 divisors (see below), whose sum is σ = 5949093780. Its totient is φ = 1057616640.

The previous prime is 2644041629. The next prime is 2644041641. The reversal of 2644041640 is 461404462.

It can be written as a sum of positive squares in 2 ways, for example, as 2576374564 + 67667076 = 50758^2 + 8226^2 .

It is not an unprimeable number, because it can be changed into a prime (2644041641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33050481 + ... + 33050560.

Almost surely, 2^2644041640 is an apocalyptic number.

2644041640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2644041640 is an abundant number, since it is smaller than the sum of its proper divisors (3305052140).

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

2644041640 is a wasteful number, since it uses less digits than its factorization.

2644041640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66101052 (or 66101048 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 2644041640 is about 51420.2454292081. The cubic root of 2644041640 is about 1382.7895753566.

The spelling of 2644041640 in words is "two billion, six hundred forty-four million, forty-one thousand, six hundred forty".