78821851302 has 64 divisors (see below), whose sum is σ = 179886873600. Its totient is φ = 25571124000.

The previous prime is 78821851261. The next prime is 78821851307. The reversal of 78821851302 is 20315812887.

78821851302 is a `hidden beast` number, since 7 + 88 + 218 + 51 + 302 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78821851307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 367552 + ... + 541052.

It is an arithmetic number, because the mean of its divisors is an integer number (2810732400).

Almost surely, 2^78821851302 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78821851302, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89943436800).

78821851302 is an abundant number, since it is smaller than the sum of its proper divisors (101065022298).

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

78821851302 is a wasteful number, since it uses less digits than its factorization.

78821851302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173738 (or 173732 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 78821851302 in words is "seventy-eight billion, eight hundred twenty-one million, eight hundred fifty-one thousand, three hundred two".