72638233 has 4 divisors (see below), whose sum is σ = 72914688. Its totient is φ = 72361780.

The previous prime is 72638231. The next prime is 72638287. The reversal of 72638233 is 33283627.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33283627 = 13 ⋅2560279.

It is a cyclic number.

It is not a de Polignac number, because 72638233 - 2¹ = 72638231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72638231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137833 + ... + 138358.

It is an arithmetic number, because the mean of its divisors is an integer number (18228672).

Almost surely, 2^72638233 is an apocalyptic number.

It is an amenable number.

72638233 is a deficient number, since it is larger than the sum of its proper divisors (276455).

72638233 is a wasteful number, since it uses less digits than its factorization.

72638233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276454.

The product of its digits is 36288, while the sum is 34.

The square root of 72638233 is about 8522.8066386608. The cubic root of 72638233 is about 417.2423892757.

The spelling of 72638233 in words is "seventy-two million, six hundred thirty-eight thousand, two hundred thirty-three".