8213847257 has 8 divisors (see below), whose sum is σ = 10240640832. Its totient is φ = 6400400400.

The previous prime is 8213847247. The next prime is 8213847289. The reversal of 8213847257 is 7527483128.

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 8213847257 - 2³² = 3918879961 is a prime.

It is a super-2 number, since 2×8213847257² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8213847247) 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, 53336594 + ... + 53336747.

It is an arithmetic number, because the mean of its divisors is an integer number (1280080104).

Almost surely, 2^8213847257 is an apocalyptic number.

It is an amenable number.

8213847257 is a deficient number, since it is larger than the sum of its proper divisors (2026793575).

8213847257 is a wasteful number, since it uses less digits than its factorization.

8213847257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106673359.

The product of its digits is 752640, while the sum is 47.

The square root of 8213847257 is about 90630.2778159705. The cubic root of 8213847257 is about 2017.6641346246.

The spelling of 8213847257 in words is "eight billion, two hundred thirteen million, eight hundred forty-seven thousand, two hundred fifty-seven".