78364459 has 4 divisors (see below), whose sum is σ = 78676920. Its totient is φ = 78052000.

The previous prime is 78364423. The next prime is 78364471. The reversal of 78364459 is 95446387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95446387 = 971 ⋅98297.

It is a cyclic number.

It is not a de Polignac number, because 78364459 - 2⁹ = 78363947 is a prime.

It is a super-2 number, since 2×78364459² = 12281976868725362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78364499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155854 + ... + 156355.

It is an arithmetic number, because the mean of its divisors is an integer number (19669230).

Almost surely, 2^78364459 is an apocalyptic number.

78364459 is a deficient number, since it is larger than the sum of its proper divisors (312461).

78364459 is a wasteful number, since it uses less digits than its factorization.

78364459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312460.

The product of its digits is 725760, while the sum is 46.

The square root of 78364459 is about 8852.3702475665. The cubic root of 78364459 is about 427.9303082584.

The spelling of 78364459 in words is "seventy-eight million, three hundred sixty-four thousand, four hundred fifty-nine".