25272240 has 160 divisors (see below), whose sum is σ = 91660800. Its totient is φ = 5757696.

The previous prime is 25272227. The next prime is 25272241. The reversal of 25272240 is 4227252.

It is a super-2 number, since 2×25272240² = 1277372229235200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 25272240.

It is not an unprimeable number, because it can be changed into a prime (25272241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82167 + ... + 82473.

It is an arithmetic number, because the mean of its divisors is an integer number (572880).

Almost surely, 2^25272240 is an apocalyptic number.

25272240 is a gapful number since it is divisible by the number (20) 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 25272240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45830400).

25272240 is an abundant number, since it is smaller than the sum of its proper divisors (66388560).

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

25272240 is a wasteful number, since it uses less digits than its factorization.

25272240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 25272240 is about 5027.1502861959. The cubic root of 25272240 is about 293.4593237474.

Adding to 25272240 its reverse (4227252), we get a palindrome (29499492).

The spelling of 25272240 in words is "twenty-five million, two hundred seventy-two thousand, two hundred forty".