25520540 has 12 divisors (see below), whose sum is σ = 53593176. Its totient is φ = 10208208.

The previous prime is 25520527. The next prime is 25520557. The reversal of 25520540 is 4502552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637994 + ... + 638033.

It is an arithmetic number, because the mean of its divisors is an integer number (4466098).

Almost surely, 2^25520540 is an apocalyptic number.

25520540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25520540 is an abundant number, since it is smaller than the sum of its proper divisors (28072636).

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

25520540 is a wasteful number, since it uses less digits than its factorization.

25520540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276036 (or 1276034 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 25520540 is about 5051.7858228551. The cubic root of 25520540 is about 294.4172734972.

The spelling of 25520540 in words is "twenty-five million, five hundred twenty thousand, five hundred forty".