78078355072 has 64 divisors (see below), whose sum is σ = 164836814400. Its totient is φ = 36711460864.

The previous prime is 78078355037. The next prime is 78078355073. The reversal of 78078355072 is 27055387087.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (78078355073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2646579 + ... + 2675917.

It is an arithmetic number, because the mean of its divisors is an integer number (2575575225).

Almost surely, 2^78078355072 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 78078355072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82418407200).

78078355072 is an abundant number, since it is smaller than the sum of its proper divisors (86758459328).

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

78078355072 is a wasteful number, since it uses less digits than its factorization.

78078355072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30593 (or 30581 counting only the distinct ones).

The product of its (nonzero) digits is 3292800, while the sum is 52.

The spelling of 78078355072 in words is "seventy-eight billion, seventy-eight million, three hundred fifty-five thousand, seventy-two".