25689540 has 48 divisors (see below), whose sum is σ = 73120320. Its totient is φ = 6737280.

The previous prime is 25689529. The next prime is 25689553. The reversal of 25689540 is 4598652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151 + ... + 7169.

It is an arithmetic number, because the mean of its divisors is an integer number (1523340).

Almost surely, 2^25689540 is an apocalyptic number.

25689540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25689540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36560160).

25689540 is an abundant number, since it is smaller than the sum of its proper divisors (47430780).

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

25689540 is a wasteful number, since it uses less digits than its factorization.

25689540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7092 (or 7090 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 25689540 is about 5068.4849807413. The cubic root of 25689540 is about 295.0657327428.

The spelling of 25689540 in words is "twenty-five million, six hundred eighty-nine thousand, five hundred forty".