78581500720 has 80 divisors (see below), whose sum is σ = 188763632640. Its totient is φ = 30391545600.

The previous prime is 78581500693. The next prime is 78581500769. The reversal of 78581500720 is 2700518587.

It is a tau number, because it is divible by the number of its divisors (80).

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, 2890551 + ... + 2917609.

It is an arithmetic number, because the mean of its divisors is an integer number (2359545408).

Almost surely, 2^78581500720 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 78581500720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94381816320).

78581500720 is an abundant number, since it is smaller than the sum of its proper divisors (110182131920).

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

78581500720 is a wasteful number, since it uses less digits than its factorization.

78581500720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28274 (or 28268 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 43.

The spelling of 78581500720 in words is "seventy-eight billion, five hundred eighty-one million, five hundred thousand, seven hundred twenty".