2644761812 has 48 divisors (see below), whose sum is σ = 6021292032. Its totient is φ = 985622880.

The previous prime is 2644761803. The next prime is 2644761817. The reversal of 2644761812 is 2181674462.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 2644761812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2644761817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179588 + ... + 193755.

It is an arithmetic number, because the mean of its divisors is an integer number (125443584).

Almost surely, 2^2644761812 is an apocalyptic number.

2644761812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2644761812 is an abundant number, since it is smaller than the sum of its proper divisors (3376530220).

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

2644761812 is a wasteful number, since it uses less digits than its factorization.

2644761812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373388 (or 373386 counting only the distinct ones).

The product of its digits is 129024, while the sum is 41.

The square root of 2644761812 is about 51427.2477583625. The cubic root of 2644761812 is about 1382.9151099319.

The spelling of 2644761812 in words is "two billion, six hundred forty-four million, seven hundred sixty-one thousand, eight hundred twelve".