72278233 has 2 divisors, whose sum is σ = 72278234. Its totient is φ = 72278232.

The previous prime is 72278221. The next prime is 72278243. The reversal of 72278233 is 33287227.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68773849 + 3504384 = 8293^2 + 1872^2 .

It is an emirp because it is prime and its reverse (33287227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72278233 - 2⁵ = 72278201 is a prime.

It is not a weakly prime, because it can be changed into another prime (72278243) 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 as a sum of consecutive naturals, namely, 36139116 + 36139117.

It is an arithmetic number, because the mean of its divisors is an integer number (36139117).

Almost surely, 2^72278233 is an apocalyptic number.

It is an amenable number.

72278233 is a deficient number, since it is larger than the sum of its proper divisors (1).

72278233 is an equidigital number, since it uses as much as digits as its factorization.

72278233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 34.

The square root of 72278233 is about 8501.6606024941. The cubic root of 72278233 is about 416.5519535588.

The spelling of 72278233 in words is "seventy-two million, two hundred seventy-eight thousand, two hundred thirty-three".