25881990287 has 8 divisors (see below), whose sum is σ = 26676110352. Its totient is φ = 25092849600.

The previous prime is 25881990257. The next prime is 25881990311. The reversal of 25881990287 is 78209918852.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25881990287 - 2⁶ = 25881990223 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 (25881990257) 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 7 ways as a sum of consecutive naturals, for example, 1234289 + ... + 1255082.

It is an arithmetic number, because the mean of its divisors is an integer number (3334513794).

Almost surely, 2^25881990287 is an apocalyptic number.

25881990287 is a deficient number, since it is larger than the sum of its proper divisors (794120065).

25881990287 is a wasteful number, since it uses less digits than its factorization.

25881990287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2489689.

The product of its (nonzero) digits is 5806080, while the sum is 59.

The spelling of 25881990287 in words is "twenty-five billion, eight hundred eighty-one million, nine hundred ninety thousand, two hundred eighty-seven".