72215233 has 4 divisors (see below), whose sum is σ = 73439280. Its totient is φ = 70991188.

The previous prime is 72215183. The next prime is 72215237. The reversal of 72215233 is 33251227.

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.

It is a cyclic number.

It is not a de Polignac number, because 72215233 - 2⁹ = 72214721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72215198 and 72215207.

It is not an unprimeable number, because it can be changed into a prime (72215237) 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, 611935 + ... + 612052.

It is an arithmetic number, because the mean of its divisors is an integer number (18359820).

Almost surely, 2^72215233 is an apocalyptic number.

It is an amenable number.

72215233 is a deficient number, since it is larger than the sum of its proper divisors (1224047).

72215233 is a wasteful number, since it uses less digits than its factorization.

72215233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224046.

The product of its digits is 2520, while the sum is 25.

The square root of 72215233 is about 8497.9546362640. The cubic root of 72215233 is about 416.4308917474.

The spelling of 72215233 in words is "seventy-two million, two hundred fifteen thousand, two hundred thirty-three".