25045644 has 48 divisors (see below), whose sum is σ = 64977920. Its totient is φ = 7456320.

The previous prime is 25045621. The next prime is 25045649. The reversal of 25045644 is 44654052.

It is not an unprimeable number, because it can be changed into a prime (25045649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2247 + ... + 7425.

Almost surely, 2^25045644 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 25045644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32488960).

25045644 is an abundant number, since it is smaller than the sum of its proper divisors (39932276).

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

25045644 is a wasteful number, since it uses less digits than its factorization.

25045644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5230 (or 5228 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 25045644 is about 5004.5623185250. The cubic root of 25045644 is about 292.5796174528.

Adding to 25045644 its reverse (44654052), we get a palindrome (69699696).

The spelling of 25045644 in words is "twenty-five million, forty-five thousand, six hundred forty-four".