78255943 has 2 divisors, whose sum is σ = 78255944. Its totient is φ = 78255942.

The previous prime is 78255937. The next prime is 78255979. The reversal of 78255943 is 34955287.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78255943 - 2⁹ = 78255431 is a prime.

It is a super-2 number, since 2×78255943² = 12247985229638498, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78255943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78255643) 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, 39127971 + 39127972.

It is an arithmetic number, because the mean of its divisors is an integer number (39127972).

Almost surely, 2^78255943 is an apocalyptic number.

78255943 is a deficient number, since it is larger than the sum of its proper divisors (1).

78255943 is an equidigital number, since it uses as much as digits as its factorization.

78255943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 43.

The square root of 78255943 is about 8846.2389183200. The cubic root of 78255943 is about 427.7326900300.

The spelling of 78255943 in words is "seventy-eight million, two hundred fifty-five thousand, nine hundred forty-three".