25802540 has 24 divisors (see below), whose sum is σ = 55934592. Its totient is φ = 9987840.

The previous prime is 25802531. The next prime is 25802561. The reversal of 25802540 is 4520852.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20189 + ... + 21428.

It is an arithmetic number, because the mean of its divisors is an integer number (2330608).

Almost surely, 2^25802540 is an apocalyptic number.

25802540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25802540 is an abundant number, since it is smaller than the sum of its proper divisors (30132052).

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

25802540 is a wasteful number, since it uses less digits than its factorization.

25802540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41657 (or 41655 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 25802540 is about 5079.6200645324. The cubic root of 25802540 is about 295.4977329445.

The spelling of 25802540 in words is "twenty-five million, eight hundred two thousand, five hundred forty".