25449540 has 72 divisors (see below), whose sum is σ = 73109568. Its totient is φ = 6614400.

The previous prime is 25449539. The next prime is 25449551. The reversal of 25449540 is 4594452.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 168465 + ... + 168615.

Almost surely, 2^25449540 is an apocalyptic number.

25449540 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 25449540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36554784).

25449540 is an abundant number, since it is smaller than the sum of its proper divisors (47660028).

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

25449540 is a wasteful number, since it uses less digits than its factorization.

25449540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 25449540 is about 5044.7537105393. The cubic root of 25449540 is about 294.1439898131.

It can be divided in two parts, 254 and 49540, that added together give a palindrome (49794).

The spelling of 25449540 in words is "twenty-five million, four hundred forty-nine thousand, five hundred forty".