7812216 has 24 divisors (see below), whose sum is σ = 21158280. Its totient is φ = 2604048.

The previous prime is 7812191. The next prime is 7812221. The reversal of 7812216 is 6122187.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×7812216² = 122061437661312, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 7812216.

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 5 ways as a sum of consecutive naturals, for example, 54180 + ... + 54323.

It is an arithmetic number, because the mean of its divisors is an integer number (881595).

Almost surely, 2^7812216 is an apocalyptic number.

It is an amenable number.

7812216 is an abundant number, since it is smaller than the sum of its proper divisors (13346064).

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

7812216 is a wasteful number, since it uses less digits than its factorization.

7812216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108515 (or 108508 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 7812216 is about 2795.0341679486. The cubic root of 7812216 is about 198.4227270834.

The spelling of 7812216 in words is "seven million, eight hundred twelve thousand, two hundred sixteen".