78982169 has 6 divisors (see below), whose sum is σ = 91877274. Its totient is φ = 67698960.

The previous prime is 78982159. The next prime is 78982177. The reversal of 78982169 is 96128987.

It can be written as a sum of positive squares in only one way, i.e., 72454144 + 6528025 = 8512^2 + 2555^2 .

It is not a de Polignac number, because 78982169 - 2⁸ = 78981913 is a prime.

It is a super-2 number, since 2×78982169² = 12476366039889122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78982159) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 805892 + ... + 805989.

It is an arithmetic number, because the mean of its divisors is an integer number (15312879).

Almost surely, 2^78982169 is an apocalyptic number.

It is an amenable number.

78982169 is a deficient number, since it is larger than the sum of its proper divisors (12895105).

78982169 is a wasteful number, since it uses less digits than its factorization.

78982169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611895 (or 1611888 counting only the distinct ones).

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

The square root of 78982169 is about 8887.1912885906. The cubic root of 78982169 is about 429.0517575833.

The spelling of 78982169 in words is "seventy-eight million, nine hundred eighty-two thousand, one hundred sixty-nine".