78789161 has 8 divisors (see below), whose sum is σ = 86988384. Its totient is φ = 70762720.

The previous prime is 78789127. The next prime is 78789187. The reversal of 78789161 is 16198787.

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 78789161 - 2²² = 74594857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78789121) 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, 42236 + ... + 44061.

It is an arithmetic number, because the mean of its divisors is an integer number (10873548).

Almost surely, 2^78789161 is an apocalyptic number.

It is an amenable number.

78789161 is a deficient number, since it is larger than the sum of its proper divisors (8199223).

78789161 is a wasteful number, since it uses less digits than its factorization.

78789161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86391.

The product of its digits is 169344, while the sum is 47.

The square root of 78789161 is about 8876.3258727922. The cubic root of 78789161 is about 428.7019825697.

The spelling of 78789161 in words is "seventy-eight million, seven hundred eighty-nine thousand, one hundred sixty-one".