8257722642 has 24 divisors (see below), whose sum is σ = 19268020044. Its totient is φ = 2540837664.

The previous prime is 8257722589. The next prime is 8257722643. The reversal of 8257722642 is 2462277528.

It can be written as a sum of positive squares in 2 ways, for example, as 5757622641 + 2500100001 = 75879^2 + 50001^2 .

It is not an unprimeable number, because it can be changed into a prime (8257722643) 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, 17644473 + ... + 17644940.

Almost surely, 2^8257722642 is an apocalyptic number.

8257722642 is an abundant number, since it is smaller than the sum of its proper divisors (11010297402).

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

8257722642 is a wasteful number, since it uses less digits than its factorization.

8257722642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35289434 (or 35289431 counting only the distinct ones).

The product of its digits is 752640, while the sum is 45.

The square root of 8257722642 is about 90872.0124240682. The cubic root of 8257722642 is about 2021.2502995423.

The spelling of 8257722642 in words is "eight billion, two hundred fifty-seven million, seven hundred twenty-two thousand, six hundred forty-two".