78939136 has 44 divisors (see below), whose sum is σ = 159305728. Its totient is φ = 39094272.

The previous prime is 78939103. The next prime is 78939137. The reversal of 78939136 is 63193987.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78939137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129745 + ... + 130351.

Almost surely, 2^78939136 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 78939136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79652864).

78939136 is an abundant number, since it is smaller than the sum of its proper divisors (80366592).

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

78939136 is a wasteful number, since it uses less digits than its factorization.

78939136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754 (or 736 counting only the distinct ones).

The product of its digits is 244944, while the sum is 46.

The square root of 78939136 is about 8884.7698900984. The cubic root of 78939136 is about 428.9738212645.

The spelling of 78939136 in words is "seventy-eight million, nine hundred thirty-nine thousand, one hundred thirty-six".