85657720 has 32 divisors (see below), whose sum is σ = 197215920. Its totient is φ = 33465600.

The previous prime is 85657711. The next prime is 85657721. The reversal of 85657720 is 2775658.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85657721) 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 7 ways as a sum of consecutive naturals, for example, 23181 + ... + 26620.

Almost surely, 2^85657720 is an apocalyptic number.

It is an amenable number.

85657720 is an abundant number, since it is smaller than the sum of its proper divisors (111558200).

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

85657720 is a wasteful number, since it uses less digits than its factorization.

85657720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49855 (or 49851 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 40.

The square root of 85657720 is about 9255.1455958294. The cubic root of 85657720 is about 440.8141263124.

The spelling of 85657720 in words is "eighty-five million, six hundred fifty-seven thousand, seven hundred twenty".