85205540 has 24 divisors (see below), whose sum is σ = 204493632. Its totient is φ = 29213280.

The previous prime is 85205539. The next prime is 85205543. The reversal of 85205540 is 4550258.

It is not an unprimeable number, because it can be changed into a prime (85205543) 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, 304166 + ... + 304445.

It is an arithmetic number, because the mean of its divisors is an integer number (8520568).

Almost surely, 2^85205540 is an apocalyptic number.

It is an amenable number.

85205540 is an abundant number, since it is smaller than the sum of its proper divisors (119288092).

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

85205540 is a wasteful number, since it uses less digits than its factorization.

85205540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608627 (or 608625 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 85205540 is about 9230.6846983309. The cubic root of 85205540 is about 440.0370836513.

Adding to 85205540 its reverse (4550258), we get a palindrome (89755798).

The spelling of 85205540 in words is "eighty-five million, two hundred five thousand, five hundred forty".