78638083 has 4 divisors (see below), whose sum is σ = 78690400. Its totient is φ = 78585768.

The previous prime is 78638057. The next prime is 78638117. The reversal of 78638083 is 38083687.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78638083 is a prime.

It is a Duffinian 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, 23835 + ... + 26932.

It is an arithmetic number, because the mean of its divisors is an integer number (19672600).

Almost surely, 2^78638083 is an apocalyptic number.

78638083 is a deficient number, since it is larger than the sum of its proper divisors (52317).

78638083 is a wasteful number, since it uses less digits than its factorization.

78638083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52316.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 78638083 is about 8867.8116240705. The cubic root of 78638083 is about 428.4277956190.

The spelling of 78638083 in words is "seventy-eight million, six hundred thirty-eight thousand, eighty-three".