78638413 has 16 divisors (see below), whose sum is σ = 98233344. Its totient is φ = 61390080.

The previous prime is 78638387. The next prime is 78638423. The reversal of 78638413 is 31483687.

It is a cyclic number.

It is not a de Polignac number, because 78638413 - 2⁵ = 78638381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78638423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6970 + ... + 14347.

It is an arithmetic number, because the mean of its divisors is an integer number (6139584).

Almost surely, 2^78638413 is an apocalyptic number.

It is an amenable number.

78638413 is a deficient number, since it is larger than the sum of its proper divisors (19594931).

78638413 is a wasteful number, since it uses less digits than its factorization.

78638413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21372.

The product of its digits is 96768, while the sum is 40.

The square root of 78638413 is about 8867.8302306709. The cubic root of 78638413 is about 428.4283949087.

The spelling of 78638413 in words is "seventy-eight million, six hundred thirty-eight thousand, four hundred thirteen".