25420224 has 56 divisors (see below), whose sum is σ = 68844160. Its totient is φ = 8273664.

The previous prime is 25420189. The next prime is 25420229. The reversal of 25420224 is 42202452.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 25420224.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25420229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6717 + ... + 9795.

It is an arithmetic number, because the mean of its divisors is an integer number (1229360).

Almost surely, 2^25420224 is an apocalyptic number.

25420224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25420224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34422080).

25420224 is an abundant number, since it is smaller than the sum of its proper divisors (43423936).

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

25420224 is a wasteful number, since it uses less digits than its factorization.

25420224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3137 (or 3127 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 25420224 is about 5041.8472805114. The cubic root of 25420224 is about 294.0310023302.

Adding to 25420224 its reverse (42202452), we get a palindrome (67622676).

The spelling of 25420224 in words is "twenty-five million, four hundred twenty thousand, two hundred twenty-four".