85505556 has 12 divisors (see below), whose sum is σ = 199512992. Its totient is φ = 28501848.

The previous prime is 85505551. The next prime is 85505561. The reversal of 85505556 is 65550558.

It is an interprime number because it is at equal distance from previous prime (85505551) and next prime (85505561).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×85505556² = 14622400213738272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85505551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3562720 + ... + 3562743.

Almost surely, 2^85505556 is an apocalyptic number.

It is an amenable number.

85505556 is an abundant number, since it is smaller than the sum of its proper divisors (114007436).

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

85505556 is a wasteful number, since it uses less digits than its factorization.

85505556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7125470 (or 7125468 counting only the distinct ones).

The product of its (nonzero) digits is 150000, while the sum is 39.

The square root of 85505556 is about 9246.9214336448. The cubic root of 85505556 is about 440.5529480697.

The spelling of 85505556 in words is "eighty-five million, five hundred five thousand, five hundred fifty-six".