85031778 has 16 divisors (see below), whose sum is σ = 183145536. Its totient is φ = 26163600.

The previous prime is 85031717. The next prime is 85031797. The reversal of 85031778 is 87713058.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544998 + ... + 545153.

It is an arithmetic number, because the mean of its divisors is an integer number (11446596).

Almost surely, 2^85031778 is an apocalyptic number.

85031778 is an abundant number, since it is smaller than the sum of its proper divisors (98113758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85031778 is a wasteful number, since it uses less digits than its factorization.

85031778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090169.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 85031778 is about 9221.2677002677. The cubic root of 85031778 is about 439.7377535079.

The spelling of 85031778 in words is "eighty-five million, thirty-one thousand, seven hundred seventy-eight".