78021898110 has 384 divisors, whose sum is σ = 242499479040. Its totient is φ = 17887910400.

The previous prime is 78021898069. The next prime is 78021898111. The reversal of 78021898110 is 1189812087.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78021898111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 36611745 + ... + 36613875.

It is an arithmetic number, because the mean of its divisors is an integer number (631509060).

Almost surely, 2^78021898110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78021898110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121249739520).

78021898110 is an abundant number, since it is smaller than the sum of its proper divisors (164477580930).

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

78021898110 is a wasteful number, since it uses less digits than its factorization.

78021898110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246 (or 2234 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 45.

The spelling of 78021898110 in words is "seventy-eight billion, twenty-one million, eight hundred ninety-eight thousand, one hundred ten".