85680021 has 8 divisors (see below), whose sum is σ = 130560064. Its totient is φ = 48960000.

The previous prime is 85680019. The next prime is 85680029. The reversal of 85680021 is 12008658.

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

It is not a de Polignac number, because 85680021 - 2¹ = 85680019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85680029) 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, 2039980 + ... + 2040021.

It is an arithmetic number, because the mean of its divisors is an integer number (16320008).

Almost surely, 2^85680021 is an apocalyptic number.

It is an amenable number.

85680021 is a deficient number, since it is larger than the sum of its proper divisors (44880043).

85680021 is a wasteful number, since it uses less digits than its factorization.

85680021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4080011.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 85680021 is about 9256.3503066814. The cubic root of 85680021 is about 440.8523783338.

Adding to 85680021 its reverse (12008658), we get a palindrome (97688679).

The spelling of 85680021 in words is "eighty-five million, six hundred eighty thousand, twenty-one".