6857857994 has 8 divisors (see below), whose sum is σ = 11078078340. Its totient is φ = 3165165216.

The previous prime is 6857857957. The next prime is 6857858009. The reversal of 6857857994 is 4997587586.

It is a happy number.

6857857994 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6855012025 + 2845969 = 82795^2 + 1687^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131881859 + ... + 131881910.

Almost surely, 2^6857857994 is an apocalyptic number.

6857857994 is a deficient number, since it is larger than the sum of its proper divisors (4220220346).

6857857994 is a wasteful number, since it uses less digits than its factorization.

6857857994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263763784.

The product of its digits is 152409600, while the sum is 68.

The square root of 6857857994 is about 82812.1850575143. The cubic root of 6857857994 is about 1899.8945457630.

The spelling of 6857857994 in words is "six billion, eight hundred fifty-seven million, eight hundred fifty-seven thousand, nine hundred ninety-four".