25955640 has 80 divisors (see below), whose sum is σ = 87250680. Its totient is φ = 6920640.

The previous prime is 25955627. The next prime is 25955663. The reversal of 25955640 is 4655952.

25955640 is a `hidden beast` number, since 2 + 5 + 9 + 5 + 5 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25955595 and 25955604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 766 + ... + 7245.

Almost surely, 2^25955640 is an apocalyptic number.

25955640 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 25955640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43625340).

25955640 is an abundant number, since it is smaller than the sum of its proper divisors (61295040).

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

25955640 is a wasteful number, since it uses less digits than its factorization.

25955640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8034 (or 8021 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 25955640 is about 5094.6678007501. The cubic root of 25955640 is about 296.0810284621.

The spelling of 25955640 in words is "twenty-five million, nine hundred fifty-five thousand, six hundred forty".