8256742887 has 8 divisors (see below), whose sum is σ = 11009758336. Its totient is φ = 5504111352.

The previous prime is 8256742817. The next prime is 8256742909. The reversal of 8256742887 is 7882476528.

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

It is a de Polignac number, because none of the positive numbers 2^k-8256742887 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 (8256742817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41353 + ... + 134994.

It is an arithmetic number, because the mean of its divisors is an integer number (1376219792).

Almost surely, 2^8256742887 is an apocalyptic number.

8256742887 is a deficient number, since it is larger than the sum of its proper divisors (2753015449).

8256742887 is a wasteful number, since it uses less digits than its factorization.

8256742887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191957.

The product of its digits is 12042240, while the sum is 57.

The square root of 8256742887 is about 90866.6214129259. The cubic root of 8256742887 is about 2021.1703578724.

The spelling of 8256742887 in words is "eight billion, two hundred fifty-six million, seven hundred forty-two thousand, eight hundred eighty-seven".