72771222 has 16 divisors (see below), whose sum is σ = 148927680. Its totient is φ = 23692872.

The previous prime is 72771211. The next prime is 72771233. The reversal of 72771222 is 22217727.

It is an interprime number because it is at equal distance from previous prime (72771211) and next prime (72771233).

It is a self number, because there is not a number n which added to its sum of digits gives 72771222.

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 7 ways as a sum of consecutive naturals, for example, 140772 + ... + 141287.

It is an arithmetic number, because the mean of its divisors is an integer number (9307980).

Almost surely, 2^72771222 is an apocalyptic number.

72771222 is an abundant number, since it is smaller than the sum of its proper divisors (76156458).

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

72771222 is a wasteful number, since it uses less digits than its factorization.

72771222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282107.

The product of its digits is 5488, while the sum is 30.

The square root of 72771222 is about 8530.6050195751. The cubic root of 72771222 is about 417.4968687539.

Adding to 72771222 its reverse (22217727), we get a palindrome (94988949).

The spelling of 72771222 in words is "seventy-two million, seven hundred seventy-one thousand, two hundred twenty-two".