78686469 has 6 divisors (see below), whose sum is σ = 113658246. Its totient is φ = 52457640.

The previous prime is 78686459. The next prime is 78686479. The reversal of 78686469 is 96468687.

It is an interprime number because it is at equal distance from previous prime (78686459) and next prime (78686479).

It can be written as a sum of positive squares in only one way, i.e., 69505569 + 9180900 = 8337^2 + 3030^2 .

It is not a de Polignac number, because 78686469 - 2⁸ = 78686213 is a prime.

It is a super-2 number, since 2×78686469² = 12383120807375922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78686459) 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, 4371462 + ... + 4371479.

It is an arithmetic number, because the mean of its divisors is an integer number (18943041).

Almost surely, 2^78686469 is an apocalyptic number.

It is an amenable number.

78686469 is a deficient number, since it is larger than the sum of its proper divisors (34971777).

78686469 is a wasteful number, since it uses less digits than its factorization.

78686469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8742947 (or 8742944 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 78686469 is about 8870.5393860802. The cubic root of 78686469 is about 428.5156481212.

The spelling of 78686469 in words is "seventy-eight million, six hundred eighty-six thousand, four hundred sixty-nine".