78838599840 has 1536 divisors, whose sum is σ = 353752842240. Its totient is φ = 14233190400.

The previous prime is 78838599817. The next prime is 78838599841. The reversal of 78838599840 is 4899583887.

It is not an unprimeable number, because it can be changed into a prime (78838599841) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 997956921 + ... + 997956999.

It is an arithmetic number, because the mean of its divisors is an integer number (230307840).

Almost surely, 2^78838599840 is an apocalyptic number.

78838599840 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 78838599840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176876421120).

78838599840 is an abundant number, since it is smaller than the sum of its proper divisors (274914242400).

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

78838599840 is a wasteful number, since it uses less digits than its factorization.

78838599840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 139345920, while the sum is 69.

The spelling of 78838599840 in words is "seventy-eight billion, eight hundred thirty-eight million, five hundred ninety-nine thousand, eight hundred forty".