78839040 has 216 divisors, whose sum is σ = 293600160. Its totient is φ = 17977344.

The previous prime is 78839027. The next prime is 78839071. The reversal of 78839040 is 4093887.

It is a self number, because there is not a number n which added to its sum of digits gives 78839040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 187951 + ... + 188369.

It is an arithmetic number, because the mean of its divisors is an integer number (1359260).

Almost surely, 2^78839040 is an apocalyptic number.

78839040 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78839040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146800080).

78839040 is an abundant number, since it is smaller than the sum of its proper divisors (214761120).

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

78839040 is a wasteful number, since it uses less digits than its factorization.

78839040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 78839040 is about 8879.1350930144. The cubic root of 78839040 is about 428.7924295092.

The spelling of 78839040 in words is "seventy-eight million, eight hundred thirty-nine thousand, forty".