85809555 has 24 divisors (see below), whose sum is σ = 160178928. Its totient is φ = 42244416.

The previous prime is 85809551. The next prime is 85809569. The reversal of 85809555 is 55590858.

It is not a de Polignac number, because 85809555 - 2² = 85809551 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 85809555.

It is not an unprimeable number, because it can be changed into a prime (85809551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72757 + ... + 73926.

It is an arithmetic number, because the mean of its divisors is an integer number (6674122).

Almost surely, 2^85809555 is an apocalyptic number.

85809555 is a deficient number, since it is larger than the sum of its proper divisors (74369373).

85809555 is a wasteful number, since it uses less digits than its factorization.

85809555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146707 (or 146704 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 45.

The square root of 85809555 is about 9263.3446983258. The cubic root of 85809555 is about 441.0744317269.

The spelling of 85809555 in words is "eighty-five million, eight hundred nine thousand, five hundred fifty-five".