78555233 has 2 divisors, whose sum is σ = 78555234. Its totient is φ = 78555232.

The previous prime is 78555193. The next prime is 78555241. The reversal of 78555233 is 33255587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71031184 + 7524049 = 8428^2 + 2743^2 .

It is a cyclic number.

It is not a de Polignac number, because 78555233 - 2¹⁴ = 78538849 is a prime.

It is not a weakly prime, because it can be changed into another prime (78555133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39277616 + 39277617.

It is an arithmetic number, because the mean of its divisors is an integer number (39277617).

Almost surely, 2^78555233 is an apocalyptic number.

It is an amenable number.

78555233 is a deficient number, since it is larger than the sum of its proper divisors (1).

78555233 is an equidigital number, since it uses as much as digits as its factorization.

78555233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126000, while the sum is 38.

The square root of 78555233 is about 8863.1390037616. The cubic root of 78555233 is about 428.2772845084.

The spelling of 78555233 in words is "seventy-eight million, five hundred fifty-five thousand, two hundred thirty-three".