85185890 has 32 divisors (see below), whose sum is σ = 158065776. Its totient is φ = 33039360.

The previous prime is 85185887. The next prime is 85185899. The reversal of 85185890 is 9858158.

It can be written as a sum of positive squares in 8 ways, for example, as 31618129 + 53567761 = 5623^2 + 7319^2 .

It is not an unprimeable number, because it can be changed into a prime (85185899) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 43574 + ... + 45486.

Almost surely, 2^85185890 is an apocalyptic number.

85185890 is a deficient number, since it is larger than the sum of its proper divisors (72879886).

85185890 is a wasteful number, since it uses less digits than its factorization.

85185890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054.

The product of its (nonzero) digits is 115200, while the sum is 44.

The square root of 85185890 is about 9229.6202522097. The cubic root of 85185890 is about 440.0032541082.

The spelling of 85185890 in words is "eighty-five million, one hundred eighty-five thousand, eight hundred ninety".