78459 has 4 divisors (see below), whose sum is σ = 104616. Its totient is φ = 52304.

The previous prime is 78439. The next prime is 78467. The reversal of 78459 is 95487.

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 78459 - 2⁵ = 78427 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (78439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13074 + ... + 13079.

It is an arithmetic number, because the mean of its divisors is an integer number (26154).

2⁷⁸⁴⁵⁹ is an apocalyptic number.

78459 is a deficient number, since it is larger than the sum of its proper divisors (26157).

78459 is a wasteful number, since it uses less digits than its factorization.

78459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26156.

The product of its digits is 10080, while the sum is 33.

The square root of 78459 is about 280.1053373287. The cubic root of 78459 is about 42.8102327995.

The spelling of 78459 in words is "seventy-eight thousand, four hundred fifty-nine".