6887645 has 8 divisors (see below), whose sum is σ = 8550360. Its totient is φ = 5320000.

The previous prime is 6887627. The next prime is 6887663. The reversal of 6887645 is 5467886.

It is an interprime number because it is at equal distance from previous prime (6887627) and next prime (6887663).

It can be written as a sum of positive squares in 4 ways, for example, as 948676 + 5938969 = 974^2 + 2437^2 .

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

It is not a de Polignac number, because 6887645 - 2⁸ = 6887389 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6887596 and 6887605.

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, 23606 + ... + 23895.

It is an arithmetic number, because the mean of its divisors is an integer number (1068795).

Almost surely, 2^6887645 is an apocalyptic number.

It is an amenable number.

6887645 is a deficient number, since it is larger than the sum of its proper divisors (1662715).

6887645 is a wasteful number, since it uses less digits than its factorization.

6887645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47535.

The product of its digits is 322560, while the sum is 44.

The square root of 6887645 is about 2624.4323195693. The cubic root of 6887645 is about 190.2641294173.

It can be divided in two parts, 68876 and 45, that added together give a cube (68921 = 41³).

The spelling of 6887645 in words is "six million, eight hundred eighty-seven thousand, six hundred forty-five".