2644630416 has 60 divisors (see below), whose sum is σ = 7423390572. Its totient is φ = 878911488.

The previous prime is 2644630363. The next prime is 2644630477. The reversal of 2644630416 is 6140364462.

2644630416 is a `hidden beast` number, since 2 + 6 + 4 + 4 + 630 + 4 + 16 = 666.

2644630416 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 834978816 + 1809651600 = 28896^2 + 42540^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21280 + ... + 75776.

Almost surely, 2^2644630416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2644630416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3711695286).

2644630416 is an abundant number, since it is smaller than the sum of its proper divisors (4778760156).

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

2644630416 is a wasteful number, since it uses less digits than its factorization.

2644630416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54848 (or 54839 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 2644630416 is about 51425.9702485038. The cubic root of 2644630416 is about 1382.8922077406.

Adding to 2644630416 its reverse (6140364462), we get a palindrome (8784994878).

The spelling of 2644630416 in words is "two billion, six hundred forty-four million, six hundred thirty thousand, four hundred sixteen".