85144778 has 16 divisors (see below), whose sum is σ = 129790080. Its totient is φ = 41885376.

The previous prime is 85144769. The next prime is 85144799. The reversal of 85144778 is 87744158.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54050 + ... + 55602.

It is an arithmetic number, because the mean of its divisors is an integer number (8111880).

Almost surely, 2^85144778 is an apocalyptic number.

85144778 is a deficient number, since it is larger than the sum of its proper divisors (44645302).

85144778 is a wasteful number, since it uses less digits than its factorization.

85144778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981.

The product of its digits is 250880, while the sum is 44.

The square root of 85144778 is about 9227.3928062048. The cubic root of 85144778 is about 439.9324586410.

The spelling of 85144778 in words is "eighty-five million, one hundred forty-four thousand, seven hundred seventy-eight".