25616540 has 48 divisors (see below), whose sum is σ = 56340480. Its totient is φ = 9771840.

The previous prime is 25616533. The next prime is 25616567. The reversal of 25616540 is 4561652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48719 + ... + 49241.

It is an arithmetic number, because the mean of its divisors is an integer number (1173760).

Almost surely, 2^25616540 is an apocalyptic number.

25616540 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 25616540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28170240).

25616540 is an abundant number, since it is smaller than the sum of its proper divisors (30723940).

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

25616540 is a wasteful number, since it uses less digits than its factorization.

25616540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 25616540 is about 5061.2784946098. The cubic root of 25616540 is about 294.7859790190.

The spelling of 25616540 in words is "twenty-five million, six hundred sixteen thousand, five hundred forty".