78081233 has 2 divisors, whose sum is σ = 78081234. Its totient is φ = 78081232.

The previous prime is 78081173. The next prime is 78081239. The reversal of 78081233 is 33218087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76877824 + 1203409 = 8768^2 + 1097^2 .

It is a cyclic number.

It is not a de Polignac number, because 78081233 - 2¹⁶ = 78015697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78081233.

It is not a weakly prime, because it can be changed into another prime (78081239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39040616 + 39040617.

It is an arithmetic number, because the mean of its divisors is an integer number (39040617).

Almost surely, 2^78081233 is an apocalyptic number.

It is an amenable number.

78081233 is a deficient number, since it is larger than the sum of its proper divisors (1).

78081233 is an equidigital number, since it uses as much as digits as its factorization.

78081233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 78081233 is about 8836.3585825837. The cubic root of 78081233 is about 427.4141418721.

The spelling of 78081233 in words is "seventy-eight million, eighty-one thousand, two hundred thirty-three".