78828169 has 8 divisors (see below), whose sum is σ = 94831040. Its totient is φ = 64010736.

The previous prime is 78828161. The next prime is 78828173. The reversal of 78828169 is 96182887.

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 78828169 - 2³ = 78828161 is a prime.

It is a super-2 number, since 2×78828169² = 12427760455785122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78828161) 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, 296214 + ... + 296479.

It is an arithmetic number, because the mean of its divisors is an integer number (11853880).

Almost surely, 2^78828169 is an apocalyptic number.

It is an amenable number.

78828169 is a deficient number, since it is larger than the sum of its proper divisors (16002871).

78828169 is a wasteful number, since it uses less digits than its factorization.

78828169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592719.

The product of its digits is 387072, while the sum is 49.

The square root of 78828169 is about 8878.5229064299. The cubic root of 78828169 is about 428.7727200828.

The spelling of 78828169 in words is "seventy-eight million, eight hundred twenty-eight thousand, one hundred sixty-nine".