8256489642 has 24 divisors (see below), whose sum is σ = 18003010116. Its totient is φ = 2734632576.

The previous prime is 8256489623. The next prime is 8256489643. The reversal of 8256489642 is 2469846528.

It can be written as a sum of positive squares in 2 ways, for example, as 8209990881 + 46498761 = 90609^2 + 6819^2 .

It is not an unprimeable number, because it can be changed into a prime (8256489643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1457983 + ... + 1463634.

Almost surely, 2^8256489642 is an apocalyptic number.

8256489642 is an abundant number, since it is smaller than the sum of its proper divisors (9746520474).

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

8256489642 is a wasteful number, since it uses less digits than its factorization.

8256489642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2921782 (or 2921779 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 54.

The square root of 8256489642 is about 90865.2279037476. The cubic root of 8256489642 is about 2021.1496936901.

The spelling of 8256489642 in words is "eight billion, two hundred fifty-six million, four hundred eighty-nine thousand, six hundred forty-two".