78804320280 has 128 divisors (see below), whose sum is σ = 270322790400. Its totient is φ = 18003313152.

The previous prime is 78804320263. The next prime is 78804320291. The reversal of 78804320280 is 8202340887.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1715289 + ... + 1760631.

It is an arithmetic number, because the mean of its divisors is an integer number (2111896800).

Almost surely, 2^78804320280 is an apocalyptic number.

78804320280 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 78804320280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135161395200).

78804320280 is an abundant number, since it is smaller than the sum of its proper divisors (191518470120).

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

78804320280 is a wasteful number, since it uses less digits than its factorization.

78804320280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47433 (or 47429 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 42.

The spelling of 78804320280 in words is "seventy-eight billion, eight hundred four million, three hundred twenty thousand, two hundred eighty".