78181678828 has 48 divisors (see below), whose sum is σ = 159600557088. Its totient is φ = 33115520000.

The previous prime is 78181678823. The next prime is 78181678831. The reversal of 78181678828 is 82887618187.

It is a super-2 number, since 2×78181678828² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78181678828.

It is not an unprimeable number, because it can be changed into a prime (78181678823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441883 + ... + 592978.

It is an arithmetic number, because the mean of its divisors is an integer number (3325011606).

Almost surely, 2^78181678828 is an apocalyptic number.

It is an amenable number.

78181678828 is an abundant number, since it is smaller than the sum of its proper divisors (81418878260).

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

78181678828 is a wasteful number, since it uses less digits than its factorization.

78181678828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034994 (or 1034992 counting only the distinct ones).

The product of its digits is 19267584, while the sum is 64.

The spelling of 78181678828 in words is "seventy-eight billion, one hundred eighty-one million, six hundred seventy-eight thousand, eight hundred twenty-eight".