78431459 has 4 divisors (see below), whose sum is σ = 78450240. Its totient is φ = 78412680.

The previous prime is 78431447. The next prime is 78431501. The reversal of 78431459 is 95413487.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78431459 - 2²⁰ = 77382883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78431359) 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 in 3 ways as a sum of consecutive naturals, for example, 14 + ... + 12524.

It is an arithmetic number, because the mean of its divisors is an integer number (19612560).

Almost surely, 2^78431459 is an apocalyptic number.

78431459 is a deficient number, since it is larger than the sum of its proper divisors (18781).

78431459 is a wasteful number, since it uses less digits than its factorization.

78431459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18780.

The product of its digits is 120960, while the sum is 41.

The square root of 78431459 is about 8856.1537362446. The cubic root of 78431459 is about 428.0522307207.

The spelling of 78431459 in words is "seventy-eight million, four hundred thirty-one thousand, four hundred fifty-nine".