85991878 has 8 divisors (see below), whose sum is σ = 147414672. Its totient is φ = 36853656.

The previous prime is 85991849. The next prime is 85991881. The reversal of 85991878 is 87819958.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3071125 + ... + 3071152.

It is an arithmetic number, because the mean of its divisors is an integer number (18426834).

Almost surely, 2^85991878 is an apocalyptic number.

85991878 is a deficient number, since it is larger than the sum of its proper divisors (61422794).

85991878 is a wasteful number, since it uses less digits than its factorization.

85991878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6142286.

The product of its digits is 1451520, while the sum is 55.

The square root of 85991878 is about 9273.1805762640. The cubic root of 85991878 is about 441.3866002454.

The spelling of 85991878 in words is "eighty-five million, nine hundred ninety-one thousand, eight hundred seventy-eight".