6857645 has 8 divisors (see below), whose sum is σ = 8246904. Its totient is φ = 5474304.

The previous prime is 6857639. The next prime is 6857671. The reversal of 6857645 is 5467586.

It can be written as a sum of positive squares in 4 ways, for example, as 2316484 + 4541161 = 1522^2 + 2131^2 .

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 6857645 - 2⁶ = 6857581 is a prime.

It is a super-3 number, since 3×6857645³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1697 + ... + 4073.

It is an arithmetic number, because the mean of its divisors is an integer number (1030863).

Almost surely, 2^6857645 is an apocalyptic number.

It is an amenable number.

6857645 is a deficient number, since it is larger than the sum of its proper divisors (1389259).

6857645 is a wasteful number, since it uses less digits than its factorization.

6857645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2959.

The product of its digits is 201600, while the sum is 41.

The square root of 6857645 is about 2618.7105605622. The cubic root of 6857645 is about 189.9874876340.

The spelling of 6857645 in words is "six million, eight hundred fifty-seven thousand, six hundred forty-five".