6821164 has 12 divisors (see below), whose sum is σ = 13642384. Its totient is φ = 2923344.

The previous prime is 6821161. The next prime is 6821173. The reversal of 6821164 is 4611286.

6821164 is an admirable number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 243613 = 6821164 / (6 + 8 + 2 + 1 + 1 + 6 + 4).

It is not an unprimeable number, because it can be changed into a prime (6821161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121779 + ... + 121834.

Almost surely, 2^6821164 is an apocalyptic number.

It is an amenable number.

6821164 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6821164 is a wasteful number, since it uses less digits than its factorization.

6821164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243624 (or 243622 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 6821164 is about 2611.7358212499. The cubic root of 6821164 is about 189.6499927515.

The spelling of 6821164 in words is "six million, eight hundred twenty-one thousand, one hundred sixty-four".