78566233 has 2 divisors, whose sum is σ = 78566234. Its totient is φ = 78566232.

The previous prime is 78566221. The next prime is 78566239. The reversal of 78566233 is 33266587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39778249 + 38787984 = 6307^2 + 6228^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78566233 is a prime.

It is not a weakly prime, because it can be changed into another prime (78566239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39283116 + 39283117.

It is an arithmetic number, because the mean of its divisors is an integer number (39283117).

Almost surely, 2^78566233 is an apocalyptic number.

It is an amenable number.

78566233 is a deficient number, since it is larger than the sum of its proper divisors (1).

78566233 is an equidigital number, since it uses as much as digits as its factorization.

78566233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 40.

The square root of 78566233 is about 8863.7595296804. The cubic root of 78566233 is about 428.2972739692.

The spelling of 78566233 in words is "seventy-eight million, five hundred sixty-six thousand, two hundred thirty-three".