25878218940 has 144 divisors (see below), whose sum is σ = 90283257792. Its totient is φ = 5877301248.

The previous prime is 25878218909. The next prime is 25878218957. The reversal of 25878218940 is 4981287852.

25878218940 is a `hidden beast` number, since 2 + 587 + 8 + 2 + 18 + 9 + 40 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132412 + ... + 263228.

It is an arithmetic number, because the mean of its divisors is an integer number (626967068).

Almost surely, 2^25878218940 is an apocalyptic number.

25878218940 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 25878218940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45141628896).

25878218940 is an abundant number, since it is smaller than the sum of its proper divisors (64405038852).

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

25878218940 is a wasteful number, since it uses less digits than its factorization.

25878218940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130996 (or 130991 counting only the distinct ones).

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

The spelling of 25878218940 in words is "twenty-five billion, eight hundred seventy-eight million, two hundred eighteen thousand, nine hundred forty".