7721166 has 16 divisors (see below), whose sum is σ = 15801984. Its totient is φ = 2513784.

The previous prime is 7721149. The next prime is 7721167. The reversal of 7721166 is 6611277.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7721167) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14706 + ... + 15221.

It is an arithmetic number, because the mean of its divisors is an integer number (987624).

Almost surely, 2^7721166 is an apocalyptic number.

7721166 is an abundant number, since it is smaller than the sum of its proper divisors (8080818).

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

7721166 is a wasteful number, since it uses less digits than its factorization.

7721166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29975.

The product of its digits is 3528, while the sum is 30.

The square root of 7721166 is about 2778.6986162591. The cubic root of 7721166 is about 197.6488521600.

It can be divided in two parts, 77211 and 66, that added together give a palindrome (77277).

The spelling of 7721166 in words is "seven million, seven hundred twenty-one thousand, one hundred sixty-six".