8643138470 has 16 divisors (see below), whose sum is σ = 16472805408. Its totient is φ = 3253887360.

The previous prime is 8643138443. The next prime is 8643138479. The reversal of 8643138470 is 748313468.

It is a super-2 number, since 2×8643138470² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8643138479) 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, 25420826 + ... + 25421165.

It is an arithmetic number, because the mean of its divisors is an integer number (1029550338).

Almost surely, 2^8643138470 is an apocalyptic number.

8643138470 is a deficient number, since it is larger than the sum of its proper divisors (7829666938).

8643138470 is a wasteful number, since it uses less digits than its factorization.

8643138470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50842015.

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 8643138470 is about 92968.4810567539. The cubic root of 8643138470 is about 2052.2195646474.

The spelling of 8643138470 in words is "eight billion, six hundred forty-three million, one hundred thirty-eight thousand, four hundred seventy".