6861636 has 36 divisors (see below), whose sum is σ = 18100992. Its totient is φ = 2187504.

The previous prime is 6861629. The next prime is 6861691. The reversal of 6861636 is 6361686.

6861636 is a `hidden beast` number, since 6 + 8 + 616 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 6861636.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3316 + ... + 4971.

Almost surely, 2^6861636 is an apocalyptic number.

It is an amenable number.

6861636 is an abundant number, since it is smaller than the sum of its proper divisors (11239356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6861636 is a wasteful number, since it uses less digits than its factorization.

6861636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8320 (or 8315 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 6861636 is about 2619.4724659748. The cubic root of 6861636 is about 190.0243366795.

The spelling of 6861636 in words is "six million, eight hundred sixty-one thousand, six hundred thirty-six".