78681585 has 8 divisors (see below), whose sum is σ = 125890560. Its totient is φ = 41963504.

The previous prime is 78681571. The next prime is 78681587. The reversal of 78681585 is 58518687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78681585 - 2⁴ = 78681569 is a prime.

It is a super-2 number, since 2×78681585² = 12381583636224450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78681587) 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 7 ways as a sum of consecutive naturals, for example, 2622705 + ... + 2622734.

It is an arithmetic number, because the mean of its divisors is an integer number (15736320).

Almost surely, 2^78681585 is an apocalyptic number.

It is an amenable number.

78681585 is a deficient number, since it is larger than the sum of its proper divisors (47208975).

78681585 is a wasteful number, since it uses less digits than its factorization.

78681585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5245447.

The product of its digits is 537600, while the sum is 48.

The square root of 78681585 is about 8870.2640885151. The cubic root of 78681585 is about 428.5067820745.

It can be divided in two parts, 7868 and 1585, that added together give a triangular number (9453 = T₁₃₇).

The spelling of 78681585 in words is "seventy-eight million, six hundred eighty-one thousand, five hundred eighty-five".