25871982840 has 288 divisors, whose sum is σ = 94396760640. Its totient is φ = 6138063360.

The previous prime is 25871982767. The next prime is 25871982901. The reversal of 25871982840 is 4828917852.

25871982840 is a `hidden beast` number, since 2 + 587 + 19 + 8 + 2 + 8 + 40 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2041002 + ... + 2053638.

It is an arithmetic number, because the mean of its divisors is an integer number (327766530).

Almost surely, 2^25871982840 is an apocalyptic number.

25871982840 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 25871982840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47198380320).

25871982840 is an abundant number, since it is smaller than the sum of its proper divisors (68524777800).

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

25871982840 is a wasteful number, since it uses less digits than its factorization.

25871982840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12723 (or 12705 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 25871982840 in words is "twenty-five billion, eight hundred seventy-one million, nine hundred eighty-two thousand, eight hundred forty".