85680109 has 4 divisors (see below), whose sum is σ = 85699516. Its totient is φ = 85660704.

The previous prime is 85680073. The next prime is 85680131. The reversal of 85680109 is 90108658.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20958084 + 64722025 = 4578^2 + 8045^2 .

It is a cyclic number.

It is not a de Polignac number, because 85680109 - 2⁷ = 85679981 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 (85680149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487 + ... + 13099.

It is an arithmetic number, because the mean of its divisors is an integer number (21424879).

Almost surely, 2^85680109 is an apocalyptic number.

It is an amenable number.

85680109 is a deficient number, since it is larger than the sum of its proper divisors (19407).

85680109 is a wasteful number, since it uses less digits than its factorization.

85680109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19406.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 85680109 is about 9256.3550601735. The cubic root of 85680109 is about 440.8525292635.

The spelling of 85680109 in words is "eighty-five million, six hundred eighty thousand, one hundred nine".