25541540 has 24 divisors (see below), whose sum is σ = 54395712. Its totient is φ = 10072160.

The previous prime is 25541533. The next prime is 25541557. The reversal of 25541540 is 4514552.

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, 7574 + ... + 10413.

It is an arithmetic number, because the mean of its divisors is an integer number (2266488).

Almost surely, 2^25541540 is an apocalyptic number.

25541540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25541540 is an abundant number, since it is smaller than the sum of its proper divisors (28854172).

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

25541540 is a wasteful number, since it uses less digits than its factorization.

25541540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18067 (or 18065 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 25541540 is about 5053.8638683684. The cubic root of 25541540 is about 294.4980067373.

The spelling of 25541540 in words is "twenty-five million, five hundred forty-one thousand, five hundred forty".