78811672189 has 8 divisors (see below), whose sum is σ = 87075812160. Its totient is φ = 70950661056.

The previous prime is 78811672139. The next prime is 78811672211. The reversal of 78811672189 is 98127611887.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78811672189 - 2⁹ = 78811671677 is a prime.

It is a super-2 number, since 2×78811672189² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78811672129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100781799 + ... + 100782580.

It is an arithmetic number, because the mean of its divisors is an integer number (10884476520).

Almost surely, 2^78811672189 is an apocalyptic number.

It is an amenable number.

78811672189 is a deficient number, since it is larger than the sum of its proper divisors (8264139971).

78811672189 is a wasteful number, since it uses less digits than its factorization.

78811672189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201564419.

The product of its digits is 2709504, while the sum is 58.

The spelling of 78811672189 in words is "seventy-eight billion, eight hundred eleven million, six hundred seventy-two thousand, one hundred eighty-nine".