72724222 has 4 divisors (see below), whose sum is σ = 109086336. Its totient is φ = 36362110.

The previous prime is 72724213. The next prime is 72724231. The reversal of 72724222 is 22242727.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (72724213) and next prime (72724231).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18181054 + ... + 18181057.

It is an arithmetic number, because the mean of its divisors is an integer number (27271584).

Almost surely, 2^72724222 is an apocalyptic number.

72724222 is a deficient number, since it is larger than the sum of its proper divisors (36362114).

72724222 is a wasteful number, since it uses less digits than its factorization.

72724222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36362113.

The product of its digits is 6272, while the sum is 28.

The square root of 72724222 is about 8527.8497876077. The cubic root of 72724222 is about 417.4069679285.

Adding to 72724222 its reverse (22242727), we get a palindrome (94966949).

The spelling of 72724222 in words is "seventy-two million, seven hundred twenty-four thousand, two hundred twenty-two".