78818257728 has 252 divisors, whose sum is σ = 263160438372. Its totient is φ = 22488883200.

The previous prime is 78818257703. The next prime is 78818257741. The reversal of 78818257728 is 82775281887.

It can be written as a sum of positive squares in 2 ways, for example, as 55240041024 + 23578216704 = 235032^2 + 153552^2 .

It is a tau number, because it is divible by the number of its divisors (252).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 28137928 + ... + 28140728.

Almost surely, 2^78818257728 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 78818257728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131580219186).

78818257728 is an abundant number, since it is smaller than the sum of its proper divisors (184342180644).

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

78818257728 is a wasteful number, since it uses less digits than its factorization.

78818257728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3830 (or 3810 counting only the distinct ones).

The product of its digits is 28098560, while the sum is 63.

The spelling of 78818257728 in words is "seventy-eight billion, eight hundred eighteen million, two hundred fifty-seven thousand, seven hundred twenty-eight".