78773 has 4 divisors (see below), whose sum is σ = 80940. Its totient is φ = 76608.

The previous prime is 78737. The next prime is 78779. The reversal of 78773 is 37787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37787 = 29 ⋅1303.

It can be written as a sum of positive squares in 2 ways, for example, as 47089 + 31684 = 217^2 + 178^2 .

It is a cyclic number.

It is not a de Polignac number, because 78773 - 2⁸ = 78517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78779) 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, 1028 + ... + 1101.

It is an arithmetic number, because the mean of its divisors is an integer number (20235).

2⁷⁸⁷⁷³ is an apocalyptic number.

It is an amenable number.

78773 is a deficient number, since it is larger than the sum of its proper divisors (2167).

78773 is a wasteful number, since it uses less digits than its factorization.

78773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2166.

The product of its digits is 8232, while the sum is 32.

The square root of 78773 is about 280.6652810734. The cubic root of 78773 is about 42.8672669204.

The spelling of 78773 in words is "seventy-eight thousand, seven hundred seventy-three".