25667540 has 24 divisors (see below), whose sum is σ = 56246400. Its totient is φ = 9820448.

The previous prime is 25667533. The next prime is 25667549. The reversal of 25667540 is 4576652.

It is a self number, because there is not a number n which added to its sum of digits gives 25667540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25667549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27440 + ... + 28359.

It is an arithmetic number, because the mean of its divisors is an integer number (2343600).

Almost surely, 2^25667540 is an apocalyptic number.

25667540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25667540 is an abundant number, since it is smaller than the sum of its proper divisors (30578860).

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

25667540 is a wasteful number, since it uses less digits than its factorization.

25667540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55831 (or 55829 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 25667540 is about 5066.3142421291. The cubic root of 25667540 is about 294.9814792548.

The spelling of 25667540 in words is "twenty-five million, six hundred sixty-seven thousand, five hundred forty".