78807638 has 32 divisors (see below), whose sum is σ = 145938240. Its totient is φ = 31080960.

The previous prime is 78807629. The next prime is 78807643. The reversal of 78807638 is 83670887.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 78807592 and 78807601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103178 + ... + 103938.

It is an arithmetic number, because the mean of its divisors is an integer number (4560570).

Almost surely, 2^78807638 is an apocalyptic number.

78807638 is a deficient number, since it is larger than the sum of its proper divisors (67130602).

78807638 is a wasteful number, since it uses less digits than its factorization.

78807638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 78807638 is about 8877.3666140359. The cubic root of 78807638 is about 428.7354918635.

The spelling of 78807638 in words is "seventy-eight million, eight hundred seven thousand, six hundred thirty-eight".