78928169 has 8 divisors (see below), whose sum is σ = 81773760. Its totient is φ = 76090896.

The previous prime is 78928151. The next prime is 78928193. The reversal of 78928169 is 96182987.

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

It is not a de Polignac number, because 78928169 - 2⁸ = 78927913 is a prime.

It is a super-2 number, since 2×78928169² = 12459311723385122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78928469) 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, 22214 + ... + 25520.

It is an arithmetic number, because the mean of its divisors is an integer number (10221720).

Almost surely, 2^78928169 is an apocalyptic number.

It is an amenable number.

78928169 is a deficient number, since it is larger than the sum of its proper divisors (2845591).

78928169 is a wasteful number, since it uses less digits than its factorization.

78928169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4159.

The product of its digits is 435456, while the sum is 50.

The square root of 78928169 is about 8884.1526889175. The cubic root of 78928169 is about 428.9539545924.

It can be divided in two parts, 78928 and 169, that added together give a palindrome (79097).

The spelling of 78928169 in words is "seventy-eight million, nine hundred twenty-eight thousand, one hundred sixty-nine".