77986285 has 8 divisors (see below), whose sum is σ = 100782360. Its totient is φ = 57589824.

The previous prime is 77986277. The next prime is 77986313. The reversal of 77986285 is 58268977.

It can be written as a sum of positive squares in 4 ways, for example, as 599076 + 77387209 = 774^2 + 8797^2 .

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 77986285 - 2³ = 77986277 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 599830 + ... + 599959.

It is an arithmetic number, because the mean of its divisors is an integer number (12597795).

Almost surely, 2^77986285 is an apocalyptic number.

It is an amenable number.

77986285 is a deficient number, since it is larger than the sum of its proper divisors (22796075).

77986285 is a wasteful number, since it uses less digits than its factorization.

77986285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199807.

The product of its digits is 1693440, while the sum is 52.

The square root of 77986285 is about 8830.9843732168. The cubic root of 77986285 is about 427.2408241746.

The spelling of 77986285 in words is "seventy-seven million, nine hundred eighty-six thousand, two hundred eighty-five".