78564785 has 8 divisors (see below), whose sum is σ = 101529960. Its totient is φ = 58017024.

The previous prime is 78564781. The next prime is 78564793. The reversal of 78564785 is 58746587.

It can be written as a sum of positive squares in 4 ways, for example, as 118336 + 78446449 = 344^2 + 8857^2 .

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

It is not a de Polignac number, because 78564785 - 2² = 78564781 is a prime.

It is a super-3 number, since 3×78564785³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (78564781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 604280 + ... + 604409.

It is an arithmetic number, because the mean of its divisors is an integer number (12691245).

Almost surely, 2^78564785 is an apocalyptic number.

It is an amenable number.

78564785 is a deficient number, since it is larger than the sum of its proper divisors (22965175).

78564785 is a wasteful number, since it uses less digits than its factorization.

78564785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208707.

The product of its digits is 1881600, while the sum is 50.

The square root of 78564785 is about 8863.6778483878. The cubic root of 78564785 is about 428.2946427359.

The spelling of 78564785 in words is "seventy-eight million, five hundred sixty-four thousand, seven hundred eighty-five".