72163243 has 4 divisors (see below), whose sum is σ = 72690120. Its totient is φ = 71636368.

The previous prime is 72163237. The next prime is 72163277. The reversal of 72163243 is 34236127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34236127 = 43 ⋅796189.

It is a cyclic number.

It is not a de Polignac number, because 72163243 - 2⁵ = 72163211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72163543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263233 + ... + 263506.

It is an arithmetic number, because the mean of its divisors is an integer number (18172530).

Almost surely, 2^72163243 is an apocalyptic number.

72163243 is a deficient number, since it is larger than the sum of its proper divisors (526877).

72163243 is a wasteful number, since it uses less digits than its factorization.

72163243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526876.

The product of its digits is 6048, while the sum is 28.

The square root of 72163243 is about 8494.8951141259. The cubic root of 72163243 is about 416.3309338908.

The spelling of 72163243 in words is "seventy-two million, one hundred sixty-three thousand, two hundred forty-three".