78189144393 has 8 divisors (see below), whose sum is σ = 104259318048. Its totient is φ = 52122533504.

The previous prime is 78189144389. The next prime is 78189144419. The reversal of 78189144393 is 39344198187.

It is a happy number.

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 78189144393 - 2² = 78189144389 is a prime.

It is a super-2 number, since 2×78189144393² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78189144893) 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, 839055 + ... + 927572.

It is an arithmetic number, because the mean of its divisors is an integer number (13032414756).

Almost surely, 2^78189144393 is an apocalyptic number.

It is an amenable number.

78189144393 is a deficient number, since it is larger than the sum of its proper divisors (26070173655).

78189144393 is a wasteful number, since it uses less digits than its factorization.

78189144393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781383.

The product of its digits is 5225472, while the sum is 57.

The spelling of 78189144393 in words is "seventy-eight billion, one hundred eighty-nine million, one hundred forty-four thousand, three hundred ninety-three".