78486569 has 16 divisors (see below), whose sum is σ = 97003008. Its totient is φ = 61965312.

The previous prime is 78486553. The next prime is 78486589. The reversal of 78486569 is 96568487.

It is a cyclic number.

It is not a de Polignac number, because 78486569 - 2⁴ = 78486553 is a prime.

It is a super-2 number, since 2×78486569² = 12320283026783522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78486569.

It is not an unprimeable number, because it can be changed into a prime (78486539) 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 15 ways as a sum of consecutive naturals, for example, 1424 + ... + 12609.

It is an arithmetic number, because the mean of its divisors is an integer number (6062688).

Almost surely, 2^78486569 is an apocalyptic number.

It is an amenable number.

78486569 is a deficient number, since it is larger than the sum of its proper divisors (18516439).

78486569 is a wasteful number, since it uses less digits than its factorization.

78486569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14104.

The product of its digits is 2903040, while the sum is 53.

The square root of 78486569 is about 8859.2645857317. The cubic root of 78486569 is about 428.1524644608.

The spelling of 78486569 in words is "seventy-eight million, four hundred eighty-six thousand, five hundred sixty-nine".