78785 has 8 divisors (see below), whose sum is σ = 108096. Its totient is φ = 54000.

The previous prime is 78781. The next prime is 78787. The reversal of 78785 is 58787.

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

It is not a de Polignac number, because 78785 - 2² = 78781 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 2251 = 78785 / (7 + 8 + 7 + 8 + 5).

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1091 + ... + 1160.

It is an arithmetic number, because the mean of its divisors is an integer number (13512).

2⁷⁸⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

78785 is a deficient number, since it is larger than the sum of its proper divisors (29311).

78785 is a wasteful number, since it uses less digits than its factorization.

78785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263.

The product of its digits is 15680, while the sum is 35.

The square root of 78785 is about 280.6866580370. The cubic root of 78785 is about 42.8694435591.

The spelling of 78785 in words is "seventy-eight thousand, seven hundred eighty-five".