72917233 has 4 divisors (see below), whose sum is σ = 77206500. Its totient is φ = 68627968.

The previous prime is 72917197. The next prime is 72917249. The reversal of 72917233 is 33271927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33271927 = 13 ⋅2559379.

It can be written as a sum of positive squares in 2 ways, for example, as 58110129 + 14807104 = 7623^2 + 3848^2 .

It is a cyclic number.

It is not a de Polignac number, because 72917233 - 2²¹ = 70820081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72917263) by changing a digit.

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, 2144608 + ... + 2144641.

It is an arithmetic number, because the mean of its divisors is an integer number (19301625).

Almost surely, 2^72917233 is an apocalyptic number.

It is an amenable number.

72917233 is a deficient number, since it is larger than the sum of its proper divisors (4289267).

72917233 is a wasteful number, since it uses less digits than its factorization.

72917233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4289266.

The product of its digits is 15876, while the sum is 34.

The square root of 72917233 is about 8539.1587993198. The cubic root of 72917233 is about 417.7759095101.

The spelling of 72917233 in words is "seventy-two million, nine hundred seventeen thousand, two hundred thirty-three".