78208469 has 4 divisors (see below), whose sum is σ = 78247596. Its totient is φ = 78169344.

The previous prime is 78208433. The next prime is 78208513. The reversal of 78208469 is 96480287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96480287 = 17 ⋅5675311.

It can be written as a sum of positive squares in 2 ways, for example, as 12517444 + 65691025 = 3538^2 + 8105^2 .

It is a cyclic number.

It is not a de Polignac number, because 78208469 - 2⁸ = 78208213 is a prime.

It is a super-2 number, since 2×78208469² = 12233129246647922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78208369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16394 + ... + 20619.

It is an arithmetic number, because the mean of its divisors is an integer number (19561899).

Almost surely, 2^78208469 is an apocalyptic number.

It is an amenable number.

78208469 is a deficient number, since it is larger than the sum of its proper divisors (39127).

78208469 is a wasteful number, since it uses less digits than its factorization.

78208469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39126.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 78208469 is about 8843.5552240035. Note that the first 3 decimals coincide. The cubic root of 78208469 is about 427.6461777960.

The spelling of 78208469 in words is "seventy-eight million, two hundred eight thousand, four hundred sixty-nine".