85581558 has 12 divisors (see below), whose sum is σ = 185426748. Its totient is φ = 28527180.

The previous prime is 85581557. The next prime is 85581563. The reversal of 85581558 is 85518558.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85581557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2377248 + ... + 2377283.

It is an arithmetic number, because the mean of its divisors is an integer number (15452229).

Almost surely, 2^85581558 is an apocalyptic number.

85581558 is an abundant number, since it is smaller than the sum of its proper divisors (99845190).

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

85581558 is a wasteful number, since it uses less digits than its factorization.

85581558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4754539 (or 4754536 counting only the distinct ones).

The product of its digits is 320000, while the sum is 45.

The square root of 85581558 is about 9251.0301048045. The cubic root of 85581558 is about 440.6834385748.

The spelling of 85581558 in words is "eighty-five million, five hundred eighty-one thousand, five hundred fifty-eight".