72388226 has 4 divisors (see below), whose sum is σ = 108582342. Its totient is φ = 36194112.

The previous prime is 72388189. The next prime is 72388249. The reversal of 72388226 is 62288327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62288327 = 19 ⋅3278333.

It can be written as a sum of positive squares in only one way, i.e., 46936201 + 25452025 = 6851^2 + 5045^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72388226.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18097055 + ... + 18097058.

Almost surely, 2^72388226 is an apocalyptic number.

72388226 is a deficient number, since it is larger than the sum of its proper divisors (36194116).

72388226 is a wasteful number, since it uses less digits than its factorization.

72388226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36194115.

The product of its digits is 64512, while the sum is 38.

The square root of 72388226 is about 8508.1270559389. The cubic root of 72388226 is about 416.7631493547.

The spelling of 72388226 in words is "seventy-two million, three hundred eighty-eight thousand, two hundred twenty-six".