7643906857 has 8 divisors (see below), whose sum is σ = 7660085760. Its totient is φ = 7627744800.

The previous prime is 7643906839. The next prime is 7643906863. The reversal of 7643906857 is 7586093467.

It is a happy number.

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 7643906857 - 2¹¹ = 7643904809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7643906798 and 7643906807.

It is not an unprimeable number, because it can be changed into a prime (7643906887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1291968 + ... + 1297870.

It is an arithmetic number, because the mean of its divisors is an integer number (957510720).

Almost surely, 2^7643906857 is an apocalyptic number.

It is an amenable number.

7643906857 is a deficient number, since it is larger than the sum of its proper divisors (16178903).

7643906857 is a wasteful number, since it uses less digits than its factorization.

7643906857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8423.

The product of its (nonzero) digits is 7620480, while the sum is 55.

The square root of 7643906857 is about 87429.4393039324. The cubic root of 7643906857 is about 1969.8740638572.

The spelling of 7643906857 in words is "seven billion, six hundred forty-three million, nine hundred six thousand, eight hundred fifty-seven".