72222345 has 24 divisors (see below), whose sum is σ = 134816136. Its totient is φ = 35555328.

The previous prime is 72222301. The next prime is 72222347. The reversal of 72222345 is 54322227.

It can be written as a sum of positive squares in 4 ways, for example, as 15023376 + 57198969 = 3876^2 + 7563^2 .

It is not a de Polignac number, because 72222345 - 2⁸ = 72222089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72222347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61144 + ... + 62313.

It is an arithmetic number, because the mean of its divisors is an integer number (5617339).

Almost surely, 2^72222345 is an apocalyptic number.

It is an amenable number.

72222345 is a deficient number, since it is larger than the sum of its proper divisors (62593791).

72222345 is a wasteful number, since it uses less digits than its factorization.

72222345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123481 (or 123478 counting only the distinct ones).

The product of its digits is 6720, while the sum is 27.

The square root of 72222345 is about 8498.3730795959. The cubic root of 72222345 is about 416.4445618054. Note that the first 3 decimals are identical.

The spelling of 72222345 in words is "seventy-two million, two hundred twenty-two thousand, three hundred forty-five".