25686738 has 96 divisors (see below), whose sum is σ = 71165952. Its totient is φ = 6501600.

The previous prime is 25686733. The next prime is 25686763. The reversal of 25686738 is 83768652.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25686693 and 25686702.

It is not an unprimeable number, because it can be changed into a prime (25686733) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 59383 + ... + 59813.

It is an arithmetic number, because the mean of its divisors is an integer number (741312).

Almost surely, 2^25686738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25686738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35582976).

25686738 is an abundant number, since it is smaller than the sum of its proper divisors (45479214).

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

25686738 is a wasteful number, since it uses less digits than its factorization.

25686738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500 (or 497 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 25686738 is about 5068.2085592446. The cubic root of 25686738 is about 295.0550045859.

The spelling of 25686738 in words is "twenty-five million, six hundred eighty-six thousand, seven hundred thirty-eight".