72297224 has 16 divisors (see below), whose sum is σ = 135946620. Its totient is φ = 36044800.

The previous prime is 72297217. The next prime is 72297263. The reversal of 72297224 is 42279227.

It can be written as a sum of positive squares in 2 ways, for example, as 64288324 + 8008900 = 8018^2 + 2830^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9977 + ... + 15624.

Almost surely, 2^72297224 is an apocalyptic number.

It is an amenable number.

72297224 is a deficient number, since it is larger than the sum of its proper divisors (63649396).

72297224 is a wasteful number, since it uses less digits than its factorization.

72297224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25960 (or 25956 counting only the distinct ones).

The product of its digits is 28224, while the sum is 35.

The square root of 72297224 is about 8502.7774285818. Note that the first 3 decimals coincide. The cubic root of 72297224 is about 416.5884331695.

The spelling of 72297224 in words is "seventy-two million, two hundred ninety-seven thousand, two hundred twenty-four".