78635 has 4 divisors (see below), whose sum is σ = 94368. Its totient is φ = 62904.

The previous prime is 78623. The next prime is 78643. The reversal of 78635 is 53687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 53687 = 37 ⋅1451.

It is a cyclic number.

It is not a de Polignac number, because 78635 - 2⁶ = 78571 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78598 and 78607.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7859 + ... + 7868.

It is an arithmetic number, because the mean of its divisors is an integer number (23592).

2⁷⁸⁶³⁵ is an apocalyptic number.

78635 is a deficient number, since it is larger than the sum of its proper divisors (15733).

78635 is a wasteful number, since it uses less digits than its factorization.

78635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15732.

The product of its digits is 5040, while the sum is 29.

The square root of 78635 is about 280.4193288630. The cubic root of 78635 is about 42.8422196720.

Subtracting from 78635 its sum of digits (29), we obtain a triangular number (78606 = T₃₉₆).

The spelling of 78635 in words is "seventy-eight thousand, six hundred thirty-five".