72248866 has 4 divisors (see below), whose sum is σ = 108373302. Its totient is φ = 36124432.

The previous prime is 72248857. The next prime is 72248867. The reversal of 72248866 is 66884227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66884227 = 3853 ⋅17359.

It can be written as a sum of positive squares in only one way, i.e., 56685841 + 15563025 = 7529^2 + 3945^2 .

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (72248867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18062215 + ... + 18062218.

Almost surely, 2^72248866 is an apocalyptic number.

72248866 is a deficient number, since it is larger than the sum of its proper divisors (36124436).

72248866 is a wasteful number, since it uses less digits than its factorization.

72248866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36124435.

The product of its digits is 258048, while the sum is 43.

The square root of 72248866 is about 8499.9332938559. The cubic root of 72248866 is about 416.4955302170.

The spelling of 72248866 in words is "seventy-two million, two hundred forty-eight thousand, eight hundred sixty-six".