78173301888 has 384 divisors, whose sum is σ = 250659826560. Its totient is φ = 23187456000.

The previous prime is 78173301851. The next prime is 78173301911. The reversal of 78173301888 is 88810337187.

It is a tau number, because it is divible by the number of its divisors (384).

It is a super-2 number, since 2×78173301888² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 131826520 + ... + 131827112.

It is an arithmetic number, because the mean of its divisors is an integer number (652759965).

Almost surely, 2^78173301888 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 78173301888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125329913280).

78173301888 is an abundant number, since it is smaller than the sum of its proper divisors (172486524672).

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

78173301888 is a wasteful number, since it uses less digits than its factorization.

78173301888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828 (or 813 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 54.

The spelling of 78173301888 in words is "seventy-eight billion, one hundred seventy-three million, three hundred one thousand, eight hundred eighty-eight".