85675721 has 4 divisors (see below), whose sum is σ = 85699200. Its totient is φ = 85652244.

The previous prime is 85675717. The next prime is 85675747. The reversal of 85675721 is 12757658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85675721 - 2² = 85675717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85678721) 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, 4961 + ... + 13998.

It is an arithmetic number, because the mean of its divisors is an integer number (21424800).

Almost surely, 2^85675721 is an apocalyptic number.

It is an amenable number.

85675721 is a deficient number, since it is larger than the sum of its proper divisors (23479).

85675721 is a wasteful number, since it uses less digits than its factorization.

85675721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23478.

The product of its digits is 117600, while the sum is 41.

The square root of 85675721 is about 9256.1180307946. The cubic root of 85675721 is about 440.8450032308.

The spelling of 85675721 in words is "eighty-five million, six hundred seventy-five thousand, seven hundred twenty-one".