25805540 has 24 divisors (see below), whose sum is σ = 56548800. Its totient is φ = 9873248.

The previous prime is 25805537. The next prime is 25805543. The reversal of 25805540 is 4550852.

It is an interprime number because it is at equal distance from previous prime (25805537) and next prime (25805543).

It is not an unprimeable number, because it can be changed into a prime (25805543) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 27590 + ... + 28509.

It is an arithmetic number, because the mean of its divisors is an integer number (2356200).

Almost surely, 2^25805540 is an apocalyptic number.

25805540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25805540 is an abundant number, since it is smaller than the sum of its proper divisors (30743260).

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

25805540 is a wasteful number, since it uses less digits than its factorization.

25805540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56131 (or 56129 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 25805540 is about 5079.9153536255. The cubic root of 25805540 is about 295.5091847737.

The spelling of 25805540 in words is "twenty-five million, eight hundred five thousand, five hundred forty".