78783694128 has 120 divisors (see below), whose sum is σ = 228116828160. Its totient is φ = 25356090240.

The previous prime is 78783694127. The next prime is 78783694139. The reversal of 78783694128 is 82149638787.

78783694128 is a `hidden beast` number, since 7 + 87 + 83 + 69 + 412 + 8 = 666.

It is a super-3 number, since 3×78783694128³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (78783694127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1957633 + ... + 1997471.

It is an arithmetic number, because the mean of its divisors is an integer number (1900973568).

Almost surely, 2^78783694128 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 78783694128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114058414080).

78783694128 is an abundant number, since it is smaller than the sum of its proper divisors (149333134032).

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

78783694128 is a wasteful number, since it uses less digits than its factorization.

78783694128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40327 (or 40318 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 63.

The spelling of 78783694128 in words is "seventy-eight billion, seven hundred eighty-three million, six hundred ninety-four thousand, one hundred twenty-eight".