6821630 has 32 divisors (see below), whose sum is σ = 12775968. Its totient is φ = 2620800.

The previous prime is 6821629. The next prime is 6821663. The reversal of 6821630 is 361286.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6821630.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32225 + ... + 32435.

It is an arithmetic number, because the mean of its divisors is an integer number (399249).

Almost surely, 2^6821630 is an apocalyptic number.

6821630 is a deficient number, since it is larger than the sum of its proper divisors (5954338).

6821630 is a wasteful number, since it uses less digits than its factorization.

6821630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 6821630 is about 2611.8250324246. The cubic root of 6821630 is about 189.6543114124.

The spelling of 6821630 in words is "six million, eight hundred twenty-one thousand, six hundred thirty".