8257218424 has 64 divisors (see below), whose sum is σ = 19106035200. Its totient is φ = 3257864064.

The previous prime is 8257218391. The next prime is 8257218433. The reversal of 8257218424 is 4248127528.

It is a super-2 number, since 2×8257218424² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260949 + ... + 290875.

It is an arithmetic number, because the mean of its divisors is an integer number (298531800).

Almost surely, 2^8257218424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8257218424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9553017600).

8257218424 is an abundant number, since it is smaller than the sum of its proper divisors (10848816776).

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

8257218424 is a wasteful number, since it uses less digits than its factorization.

8257218424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30332 (or 30328 counting only the distinct ones).

The product of its digits is 286720, while the sum is 43.

The square root of 8257218424 is about 90869.2380511689. The cubic root of 8257218424 is about 2021.2091594051.

The spelling of 8257218424 in words is "eight billion, two hundred fifty-seven million, two hundred eighteen thousand, four hundred twenty-four".