25686740 has 24 divisors (see below), whose sum is σ = 54057192. Its totient is φ = 10252800.

The previous prime is 25686733. The next prime is 25686763. The reversal of 25686740 is 4768652.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1263376 + 24423364 = 1124^2 + 4942^2 .

It is a super-2 number, since 2×25686740² = 1319617223655200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25686694 and 25686703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10952 + ... + 13088.

It is an arithmetic number, because the mean of its divisors is an integer number (2252383).

Almost surely, 2^25686740 is an apocalyptic number.

25686740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25686740 is an abundant number, since it is smaller than the sum of its proper divisors (28370452).

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

25686740 is a wasteful number, since it uses less digits than its factorization.

25686740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2747 (or 2745 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 25686740 is about 5068.2087565530. The cubic root of 25686740 is about 295.0550122437.

The spelling of 25686740 in words is "twenty-five million, six hundred eighty-six thousand, seven hundred forty".