85172878 has 24 divisors (see below), whose sum is σ = 150723504. Its totient is φ = 35985600.

The previous prime is 85172851. The next prime is 85172881. The reversal of 85172878 is 87827158.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 838 + ... + 13078.

It is an arithmetic number, because the mean of its divisors is an integer number (6280146).

Almost surely, 2^85172878 is an apocalyptic number.

85172878 is a deficient number, since it is larger than the sum of its proper divisors (65550626).

85172878 is a wasteful number, since it uses less digits than its factorization.

85172878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12328 (or 12321 counting only the distinct ones).

The product of its digits is 250880, while the sum is 46.

The square root of 85172878 is about 9228.9153208814. The cubic root of 85172878 is about 439.9808497175.

The spelling of 85172878 in words is "eighty-five million, one hundred seventy-two thousand, eight hundred seventy-eight".