78993 has 12 divisors (see below), whose sum is σ = 116688. Its totient is φ = 51480.

The previous prime is 78989. The next prime is 79031. The reversal of 78993 is 39987.

It is not a de Polignac number, because 78993 - 2² = 78989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 538 + ... + 668.

It is an arithmetic number, because the mean of its divisors is an integer number (9724).

2⁷⁸⁹⁹³ is an apocalyptic number.

It is an amenable number.

78993 is a deficient number, since it is larger than the sum of its proper divisors (37695).

78993 is a wasteful number, since it uses less digits than its factorization.

78993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 201 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 78993 is about 281.0569337341. The cubic root of 78993 is about 42.9071368960.

The spelling of 78993 in words is "seventy-eight thousand, nine hundred ninety-three".