78638119 has 4 divisors (see below), whose sum is σ = 89872144. Its totient is φ = 67404096.

The previous prime is 78638117. The next prime is 78638143. The reversal of 78638119 is 91183687.

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

It is a cyclic number.

It is not a de Polignac number, because 78638119 - 2¹ = 78638117 is a prime.

It is a super-2 number, since 2×78638119² = 12367907519716322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78638117) 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, 5617002 + ... + 5617015.

It is an arithmetic number, because the mean of its divisors is an integer number (22468036).

Almost surely, 2^78638119 is an apocalyptic number.

78638119 is a deficient number, since it is larger than the sum of its proper divisors (11234025).

78638119 is a wasteful number, since it uses less digits than its factorization.

78638119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11234024.

The product of its digits is 72576, while the sum is 43.

The square root of 78638119 is about 8867.8136538834. The cubic root of 78638119 is about 428.4278609962.

The spelling of 78638119 in words is "seventy-eight million, six hundred thirty-eight thousand, one hundred nineteen".