25783971840 has 728 divisors, whose sum is σ = 101846631888. Its totient is φ = 6210846720.

The previous prime is 25783971839. The next prime is 25783971877. The reversal of 25783971840 is 4817938752.

It is a happy number.

25783971840 is a `hidden beast` number, since 2 + 5 + 78 + 397 + 184 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 164229042 + ... + 164229198.

Almost surely, 2^25783971840 is an apocalyptic number.

25783971840 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 25783971840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50923315944).

25783971840 is an abundant number, since it is smaller than the sum of its proper divisors (76062660048).

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

25783971840 is an equidigital number, since it uses as much as digits as its factorization.

25783971840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 25783971840 in words is "twenty-five billion, seven hundred eighty-three million, nine hundred seventy-one thousand, eight hundred forty".