85778839 has 8 divisors (see below), whose sum is σ = 91136160. Its totient is φ = 80581536.

The previous prime is 85778831. The next prime is 85778843. The reversal of 85778839 is 93887758.

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 85778839 - 2³ = 85778831 is a prime.

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 85778839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85778831) 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, 38899 + ... + 41044.

It is an arithmetic number, because the mean of its divisors is an integer number (11392020).

Almost surely, 2^85778839 is an apocalyptic number.

85778839 is a deficient number, since it is larger than the sum of its proper divisors (5357321).

85778839 is a wasteful number, since it uses less digits than its factorization.

85778839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80009.

The product of its digits is 3386880, while the sum is 55.

The square root of 85778839 is about 9261.6866174580. The cubic root of 85778839 is about 441.0217971103.

The spelling of 85778839 in words is "eighty-five million, seven hundred seventy-eight thousand, eight hundred thirty-nine".