80721222 has 32 divisors (see below), whose sum is σ = 163665792. Its totient is φ = 26539584.

The previous prime is 80721209. The next prime is 80721227. The reversal of 80721222 is 22212708.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 80721192 and 80721201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80721227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232453 + ... + 232799.

It is an arithmetic number, because the mean of its divisors is an integer number (5114556).

Almost surely, 2^80721222 is an apocalyptic number.

80721222 is an abundant number, since it is smaller than the sum of its proper divisors (82944570).

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

80721222 is a wasteful number, since it uses less digits than its factorization.

80721222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 80721222 is about 8984.4989843619. The cubic root of 80721222 is about 432.1779209683.

The spelling of 80721222 in words is "eighty million, seven hundred twenty-one thousand, two hundred twenty-two".