2506644 has 90 divisors (see below), whose sum is σ = 7646730. Its totient is φ = 691488.

The previous prime is 2506643. The next prime is 2506649. The reversal of 2506644 is 4466052.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2160900 + 345744 = 1470^2 + 588^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2506643) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 86422 + ... + 86450.

2^2506644 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 2506644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3823365).

2506644 is an abundant number, since it is smaller than the sum of its proper divisors (5140086).

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

2506644 is a wasteful number, since it uses less digits than its factorization.

2506644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 2506644 is about 1583.2384532975. The cubic root of 2506644 is about 135.8410050827.

The spelling of 2506644 in words is "two million, five hundred six thousand, six hundred forty-four".