25478382287 has 4 divisors (see below), whose sum is σ = 25479422976. Its totient is φ = 25477341600.

The previous prime is 25478382157. The next prime is 25478382323. The reversal of 25478382287 is 78228387452.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25478382287 - 2²⁶ = 25411273423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25478352287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482714 + ... + 532887.

It is an arithmetic number, because the mean of its divisors is an integer number (6369855744).

Almost surely, 2^25478382287 is an apocalyptic number.

25478382287 is a deficient number, since it is larger than the sum of its proper divisors (1040689).

25478382287 is a wasteful number, since it uses less digits than its factorization.

25478382287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040688.

The product of its digits is 12042240, while the sum is 56.

The spelling of 25478382287 in words is "twenty-five billion, four hundred seventy-eight million, three hundred eighty-two thousand, two hundred eighty-seven".