78344243 has 2 divisors, whose sum is σ = 78344244. Its totient is φ = 78344242.

The previous prime is 78344219. The next prime is 78344249. The reversal of 78344243 is 34244387.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78344243 - 2⁶ = 78344179 is a prime.

It is a super-2 number, since 2×78344243² = 12275640822486098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78344249) 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, 39172121 + 39172122.

It is an arithmetic number, because the mean of its divisors is an integer number (39172122).

Almost surely, 2^78344243 is an apocalyptic number.

78344243 is a deficient number, since it is larger than the sum of its proper divisors (1).

78344243 is an equidigital number, since it uses as much as digits as its factorization.

78344243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 35.

The square root of 78344243 is about 8851.2283328361. The cubic root of 78344243 is about 427.8935067830.

It can be divided in two parts, 78344 and 243, that added together give a palindrome (78587).

The spelling of 78344243 in words is "seventy-eight million, three hundred forty-four thousand, two hundred forty-three".