25404540 has 72 divisors (see below), whose sum is σ = 82755792. Its totient is φ = 5806080.

The previous prime is 25404527. The next prime is 25404563. The reversal of 25404540 is 4540452.

It is a super-2 number, since 2×25404540² = 1290781305223200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25404540.

It is a congruent number.

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, 1381 + ... + 7260.

It is an arithmetic number, because the mean of its divisors is an integer number (1149386).

Almost surely, 2^25404540 is an apocalyptic number.

25404540 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 25404540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41377896).

25404540 is an abundant number, since it is smaller than the sum of its proper divisors (57351252).

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

25404540 is a wasteful number, since it uses less digits than its factorization.

25404540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8667 (or 8658 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 25404540 is about 5040.2916582277. The cubic root of 25404540 is about 293.9705185857.

Adding to 25404540 its reverse (4540452), we get a palindrome (29944992).

The spelling of 25404540 in words is "twenty-five million, four hundred four thousand, five hundred forty".