85505557 has 8 divisors (see below), whose sum is σ = 89022296. Its totient is φ = 82052352.

The previous prime is 85505551. The next prime is 85505561. The reversal of 85505557 is 75550558.

It can be written as a sum of positive squares in 4 ways, for example, as 31203396 + 54302161 = 5586^2 + 7369^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85505557 is a prime.

It is a super-2 number, since 2×85505557² = 14622400555760498, 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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13128 + ... + 18529.

It is an arithmetic number, because the mean of its divisors is an integer number (11127787).

Almost surely, 2^85505557 is an apocalyptic number.

It is an amenable number.

85505557 is a deficient number, since it is larger than the sum of its proper divisors (3516739).

85505557 is a wasteful number, since it uses less digits than its factorization.

85505557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31767.

The product of its (nonzero) digits is 175000, while the sum is 40.

The square root of 85505557 is about 9246.9214877169. The cubic root of 85505557 is about 440.5529497871.

The spelling of 85505557 in words is "eighty-five million, five hundred five thousand, five hundred fifty-seven".