78638093 has 4 divisors (see below), whose sum is σ = 82776960. Its totient is φ = 74499228.

The previous prime is 78638057. The next prime is 78638117. The reversal of 78638093 is 39083687.

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, and also an emirpimes, since its reverse is a distinct semiprime: 39083687 = 4679 ⋅8353.

It is not a de Polignac number, because 78638093 - 2⁸ = 78637837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78638033) 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, 2069405 + ... + 2069442.

It is an arithmetic number, because the mean of its divisors is an integer number (20694240).

Almost surely, 2^78638093 is an apocalyptic number.

It is an amenable number.

78638093 is a deficient number, since it is larger than the sum of its proper divisors (4138867).

78638093 is a wasteful number, since it uses less digits than its factorization.

78638093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4138866.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 78638093 is about 8867.8121879075. The cubic root of 78638093 is about 428.4278137794.

The spelling of 78638093 in words is "seventy-eight million, six hundred thirty-eight thousand, ninety-three".