25172224 has 72 divisors (see below), whose sum is σ = 62693568. Its totient is φ = 9799680.

The previous prime is 25172221. The next prime is 25172227. The reversal of 25172224 is 42227152.

It is an interprime number because it is at equal distance from previous prime (25172221) and next prime (25172227).

It is a super-2 number, since 2×25172224² = 1267281722212352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25172221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19074 + ... + 20350.

It is an arithmetic number, because the mean of its divisors is an integer number (870744).

Almost surely, 2^25172224 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 25172224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31346784).

25172224 is an abundant number, since it is smaller than the sum of its proper divisors (37521344).

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

25172224 is a wasteful number, since it uses less digits than its factorization.

25172224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311 (or 1297 counting only the distinct ones).

The product of its digits is 2240, while the sum is 25.

The square root of 25172224 is about 5017.1928406231. The cubic root of 25172224 is about 293.0716858770.

Adding to 25172224 its reverse (42227152), we get a palindrome (67399376).

The spelling of 25172224 in words is "twenty-five million, one hundred seventy-two thousand, two hundred twenty-four".