78755993 has 4 divisors (see below), whose sum is σ = 78774480. Its totient is φ = 78737508.

The previous prime is 78755987. The next prime is 78756059. The reversal of 78755993 is 39955787.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78755993 - 2²⁰ = 77707417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78755953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746 + ... + 12572.

It is an arithmetic number, because the mean of its divisors is an integer number (19693620).

Almost surely, 2^78755993 is an apocalyptic number.

It is an amenable number.

78755993 is a deficient number, since it is larger than the sum of its proper divisors (18487).

78755993 is a wasteful number, since it uses less digits than its factorization.

78755993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18486.

The product of its digits is 2381400, while the sum is 53.

The square root of 78755993 is about 8874.4573355220. The cubic root of 78755993 is about 428.6418170049.

The spelling of 78755993 in words is "seventy-eight million, seven hundred fifty-five thousand, nine hundred ninety-three".