78845 has 8 divisors (see below), whose sum is σ = 101976. Its totient is φ = 58176.

The previous prime is 78839. The next prime is 78853. The reversal of 78845 is 54887.

It can be written as a sum of positive squares in 4 ways, for example, as 2116 + 76729 = 46^2 + 277^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78845 - 2⁶ = 78781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 542 + ... + 671.

It is an arithmetic number, because the mean of its divisors is an integer number (12747).

2⁷⁸⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

78845 is a deficient number, since it is larger than the sum of its proper divisors (23131).

78845 is a wasteful number, since it uses less digits than its factorization.

78845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231.

The product of its digits is 8960, while the sum is 32.

The square root of 78845 is about 280.7935184437. The cubic root of 78845 is about 42.8803234387.

The spelling of 78845 in words is "seventy-eight thousand, eight hundred forty-five".