2644638 has 8 divisors (see below), whose sum is σ = 5289288. Its totient is φ = 881544.

The previous prime is 2644637. The next prime is 2644657. The reversal of 2644638 is 8364462.

2644638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

2644638 is an admirable number.

It is a super-2 number, since 2×2644638² = 13988220302088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2644599 and 2644608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2644637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220381 + ... + 220392.

It is an arithmetic number, because the mean of its divisors is an integer number (661161).

2^2644638 is an apocalyptic number.

2644638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2644638 is a wasteful number, since it uses less digits than its factorization.

2644638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440778.

The product of its digits is 27648, while the sum is 33.

The square root of 2644638 is about 1626.2343004623. The cubic root of 2644638 is about 138.2893529645.

The spelling of 2644638 in words is "two million, six hundred forty-four thousand, six hundred thirty-eight".