85809556 has 24 divisors (see below), whose sum is σ = 175807296. Its totient is φ = 35878080.

The previous prime is 85809551. The next prime is 85809569. The reversal of 85809556 is 65590858.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85809551) 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 7 ways as a sum of consecutive naturals, for example, 36226 + ... + 38521.

It is an arithmetic number, because the mean of its divisors is an integer number (7325304).

Almost surely, 2^85809556 is an apocalyptic number.

It is an amenable number.

85809556 is an abundant number, since it is smaller than the sum of its proper divisors (89997740).

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

85809556 is a wasteful number, since it uses less digits than its factorization.

85809556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74799 (or 74797 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 46.

The square root of 85809556 is about 9263.3447523019. The cubic root of 85809556 is about 441.0744334403.

The spelling of 85809556 in words is "eighty-five million, eight hundred nine thousand, five hundred fifty-six".