7881220 has 24 divisors (see below), whose sum is σ = 16833600. Its totient is φ = 3098592.

The previous prime is 7881193. The next prime is 7881221. The reversal of 7881220 is 221887.

It is a super-2 number, since 2×7881220² = 124227257376800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7881221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2160 + ... + 4519.

It is an arithmetic number, because the mean of its divisors is an integer number (701400).

Almost surely, 2^7881220 is an apocalyptic number.

It is an amenable number.

7881220 is an abundant number, since it is smaller than the sum of its proper divisors (8952380).

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

7881220 is a wasteful number, since it uses less digits than its factorization.

7881220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6747 (or 6745 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 7881220 is about 2807.3510646159. The cubic root of 7881220 is about 199.0052270034.

The spelling of 7881220 in words is "seven million, eight hundred eighty-one thousand, two hundred twenty".