78433819 has 2 divisors, whose sum is σ = 78433820. Its totient is φ = 78433818.

The previous prime is 78433759. The next prime is 78433829. The reversal of 78433819 is 91833487.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78433819 - 2⁹ = 78433307 is a prime.

It is a super-2 number, since 2×78433819² = 12303727925849522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78433829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39216909 + 39216910.

It is an arithmetic number, because the mean of its divisors is an integer number (39216910).

Almost surely, 2^78433819 is an apocalyptic number.

78433819 is a deficient number, since it is larger than the sum of its proper divisors (1).

78433819 is an equidigital number, since it uses as much as digits as its factorization.

78433819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 78433819 is about 8856.2869759285. The cubic root of 78433819 is about 428.0565240368.

The spelling of 78433819 in words is "seventy-eight million, four hundred thirty-three thousand, eight hundred nineteen".