78021402056 has 64 divisors (see below), whose sum is σ = 165254584320. Its totient is φ = 34263694080.

The previous prime is 78021402037. The next prime is 78021402061. The reversal of 78021402056 is 65020412087.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 371486 + ... + 542258.

It is an arithmetic number, because the mean of its divisors is an integer number (2582102880).

Almost surely, 2^78021402056 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 78021402056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82627292160).

78021402056 is an abundant number, since it is smaller than the sum of its proper divisors (87233182264).

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

78021402056 is a wasteful number, since it uses less digits than its factorization.

78021402056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171006 (or 171002 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The spelling of 78021402056 in words is "seventy-eight billion, twenty-one million, four hundred two thousand, fifty-six".