85609720 has 32 divisors (see below), whose sum is σ = 220140000. Its totient is φ = 29351808.

The previous prime is 85609673. The next prime is 85609751. The reversal of 85609720 is 2790658.

It is a self number, because there is not a number n which added to its sum of digits gives 85609720.

It is a congruent number.

It is an unprimeable number.

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, 152595 + ... + 153154.

It is an arithmetic number, because the mean of its divisors is an integer number (6879375).

Almost surely, 2^85609720 is an apocalyptic number.

It is an amenable number.

85609720 is an abundant number, since it is smaller than the sum of its proper divisors (134530280).

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

85609720 is a wasteful number, since it uses less digits than its factorization.

85609720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305767 (or 305763 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 85609720 is about 9252.5520803722. The cubic root of 85609720 is about 440.7317712851.

The spelling of 85609720 in words is "eighty-five million, six hundred nine thousand, seven hundred twenty".