25144240 has 40 divisors (see below), whose sum is σ = 63777168. Its totient is φ = 9143040.

The previous prime is 25144219. The next prime is 25144279. The reversal of 25144240 is 4244152.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13407 + ... + 15166.

Almost surely, 2^25144240 is an apocalyptic number.

25144240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25144240 is an abundant number, since it is smaller than the sum of its proper divisors (38632928).

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

25144240 is a wasteful number, since it uses less digits than its factorization.

25144240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28597 (or 28591 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 25144240 is about 5014.4032546256. The cubic root of 25144240 is about 292.9630428601.

Adding to 25144240 its reverse (4244152), we get a palindrome (29388392).

The spelling of 25144240 in words is "twenty-five million, one hundred forty-four thousand, two hundred forty".