78638336 has 54 divisors (see below), whose sum is σ = 182626290. Its totient is φ = 33696768.

The previous prime is 78638303. The next prime is 78638347. The reversal of 78638336 is 63383687.

It can be written as a sum of positive squares in only one way, i.e., 61465600 + 17172736 = 7840^2 + 4144^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9410 + ... + 15678.

Almost surely, 2^78638336 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78638336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91313145).

78638336 is an abundant number, since it is smaller than the sum of its proper divisors (103987954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78638336 is an equidigital number, since it uses as much as digits as its factorization.

78638336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6299 (or 6278 counting only the distinct ones).

The product of its digits is 435456, while the sum is 44.

The square root of 78638336 is about 8867.8258891343. The cubic root of 78638336 is about 428.4282550746.

The spelling of 78638336 in words is "seventy-eight million, six hundred thirty-eight thousand, three hundred thirty-six".