78411169 has 4 divisors (see below), whose sum is σ = 79696660. Its totient is φ = 77125680.

The previous prime is 78411149. The next prime is 78411173. The reversal of 78411169 is 96111487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96111487 = 1229 ⋅78203.

It can be written as a sum of positive squares in 2 ways, for example, as 2512225 + 75898944 = 1585^2 + 8712^2 .

It is a cyclic number.

It is not a de Polignac number, because 78411169 - 2¹⁹ = 77886881 is a prime.

It is a super-2 number, since 2×78411169² = 12296622847893122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78411149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642654 + ... + 642775.

It is an arithmetic number, because the mean of its divisors is an integer number (19924165).

Almost surely, 2^78411169 is an apocalyptic number.

It is an amenable number.

78411169 is a deficient number, since it is larger than the sum of its proper divisors (1285491).

78411169 is a wasteful number, since it uses less digits than its factorization.

78411169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285490.

The product of its digits is 12096, while the sum is 37.

The square root of 78411169 is about 8855.0081309957. The cubic root of 78411169 is about 428.0153155640.

The spelling of 78411169 in words is "seventy-eight million, four hundred eleven thousand, one hundred sixty-nine".