25997244 has 144 divisors (see below), whose sum is σ = 80438400. Its totient is φ = 6459264.

The previous prime is 25997243. The next prime is 25997297. The reversal of 25997244 is 44279952.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 25997196 and 25997205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25997243) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 145147 + ... + 145325.

It is an arithmetic number, because the mean of its divisors is an integer number (558600).

Almost surely, 2^25997244 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 25997244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40219200).

25997244 is an abundant number, since it is smaller than the sum of its proper divisors (54441156).

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

25997244 is a wasteful number, since it uses less digits than its factorization.

25997244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 223 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The square root of 25997244 is about 5098.7492583966. The cubic root of 25997244 is about 296.2391389848.

The spelling of 25997244 in words is "twenty-five million, nine hundred ninety-seven thousand, two hundred forty-four".