78356559998784 has 224 divisors, whose sum is σ = 215784221126656. Its totient is φ = 25073486807040.

The previous prime is 78356559998753. The next prime is 78356559998791. The reversal of 78356559998784 is 48789995565387.

It is a super-2 number, since 2×78356559998784² (a number of 29 digits) contains 22 as substring.

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, 163059732 + ... + 163539564.

It is an arithmetic number, because the mean of its divisors is an integer number (963322415744).

Almost surely, 2^{78356559998784} is an apocalyptic number.

78356559998784 is a gapful number since it is divisible by the number (74) 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 78356559998784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107892110563328).

78356559998784 is an abundant number, since it is smaller than the sum of its proper divisors (137427661127872).

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

78356559998784 is a wasteful number, since it uses less digits than its factorization.

78356559998784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480193 (or 480183 counting only the distinct ones).

The product of its digits is 164602368000, while the sum is 93.

The spelling of 78356559998784 in words is "seventy-eight trillion, three hundred fifty-six billion, five hundred fifty-nine million, nine hundred ninety-eight thousand, seven hundred eighty-four".