78132189018 has 32 divisors (see below), whose sum is σ = 169857487296. Its totient is φ = 23815991808.

The previous prime is 78132188969. The next prime is 78132189019. The reversal of 78132189018 is 81098123187.

It is a happy number.

It is a super-2 number, since 2×78132189018² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (78132189019) 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, 4672471 + ... + 4689162.

It is an arithmetic number, because the mean of its divisors is an integer number (5308046478).

Almost surely, 2^78132189018 is an apocalyptic number.

78132189018 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

78132189018 is an abundant number, since it is smaller than the sum of its proper divisors (91725298278).

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

78132189018 is a wasteful number, since it uses less digits than its factorization.

78132189018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9361758.

The product of its (nonzero) digits is 193536, while the sum is 48.

The spelling of 78132189018 in words is "seventy-eight billion, one hundred thirty-two million, one hundred eighty-nine thousand, eighteen".