72222722 has 32 divisors (see below), whose sum is σ = 128386944. Its totient is φ = 30288720.

The previous prime is 72222721. The next prime is 72222739. The reversal of 72222722 is 22722227.

It is a super-2 number, since 2×72222722² = 10432243146178568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 72222691 and 72222700.

It is not an unprimeable number, because it can be changed into a prime (72222721) 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 15 ways as a sum of consecutive naturals, for example, 33563 + ... + 35649.

It is an arithmetic number, because the mean of its divisors is an integer number (4012092).

Almost surely, 2^72222722 is an apocalyptic number.

72222722 is a deficient number, since it is larger than the sum of its proper divisors (56164222).

72222722 is a wasteful number, since it uses less digits than its factorization.

72222722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135 (or 2113 counting only the distinct ones).

The product of its digits is 3136, while the sum is 26.

The square root of 72222722 is about 8498.3952602830. The cubic root of 72222722 is about 416.4452864165.

Adding to 72222722 its reverse (22722227), we get a palindrome (94944949).

The spelling of 72222722 in words is "seventy-two million, two hundred twenty-two thousand, seven hundred twenty-two".