25544140 has 12 divisors (see below), whose sum is σ = 53642736. Its totient is φ = 10217648.

The previous prime is 25544131. The next prime is 25544147. The reversal of 25544140 is 4144552.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (25544147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638584 + ... + 638623.

It is an arithmetic number, because the mean of its divisors is an integer number (4470228).

Almost surely, 2^25544140 is an apocalyptic number.

25544140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25544140 is an abundant number, since it is smaller than the sum of its proper divisors (28098596).

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

25544140 is a wasteful number, since it uses less digits than its factorization.

25544140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277216 (or 1277214 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 25544140 is about 5054.1210907536. The cubic root of 25544140 is about 294.5079992024.

Adding to 25544140 its reverse (4144552), we get a palindrome (29688692).

The spelling of 25544140 in words is "twenty-five million, five hundred forty-four thousand, one hundred forty".