25461540 has 216 divisors, whose sum is σ = 89526528. Its totient is φ = 6065280.

The previous prime is 25461521. The next prime is 25461551. The reversal of 25461540 is 4516452.

25461540 is a `hidden beast` number, since 2 + 5 + 4 + 615 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 821325 + ... + 821355.

Almost surely, 2^25461540 is an apocalyptic number.

25461540 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 25461540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44763264).

25461540 is an abundant number, since it is smaller than the sum of its proper divisors (64064988).

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

25461540 is a wasteful number, since it uses less digits than its factorization.

25461540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 25461540 is about 5045.9429247664. The cubic root of 25461540 is about 294.1902142667.

Adding to 25461540 its reverse (4516452), we get a palindrome (29977992).

The spelling of 25461540 in words is "twenty-five million, four hundred sixty-one thousand, five hundred forty".