2520644 has 12 divisors (see below), whose sum is σ = 5041344. Its totient is φ = 1080264.

The previous prime is 2520631. The next prime is 2520649. The reversal of 2520644 is 4460252.

2520644 is an admirable number.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (2520649) 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, 44984 + ... + 45039.

It is an arithmetic number, because the mean of its divisors is an integer number (420112).

2^2520644 is an apocalyptic number.

It is an amenable number.

2520644 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.

2520644 is a wasteful number, since it uses less digits than its factorization.

2520644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90034 (or 90032 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 2520644 is about 1587.6536146150. The cubic root of 2520644 is about 136.0934334887.

Adding to 2520644 its reverse (4460252), we get a palindrome (6980896).

The spelling of 2520644 in words is "two million, five hundred twenty thousand, six hundred forty-four".