78394603680 has 192 divisors, whose sum is σ = 275110819200. Its totient is φ = 20849633280.

The previous prime is 78394603663. The next prime is 78394603681. The reversal of 78394603680 is 8630649387.

78394603680 is a `hidden beast` number, since 78 + 3 + 9 + 460 + 36 + 80 = 666.

It is a super-2 number, since 2×78394603680² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (78394603681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1613340 + ... + 1661220.

It is an arithmetic number, because the mean of its divisors is an integer number (1432868850).

Almost surely, 2^78394603680 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 78394603680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137555409600).

78394603680 is an abundant number, since it is smaller than the sum of its proper divisors (196716215520).

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

78394603680 is a wasteful number, since it uses less digits than its factorization.

78394603680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48284 (or 48270 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The spelling of 78394603680 in words is "seventy-eight billion, three hundred ninety-four million, six hundred three thousand, six hundred eighty".