85662721 has 4 divisors (see below), whose sum is σ = 85682772. Its totient is φ = 85642672.

The previous prime is 85662713. The next prime is 85662743. The reversal of 85662721 is 12726658.

It is a happy number.

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 2852721 + 82810000 = 1689^2 + 9100^2 .

It is a cyclic number.

It is not a de Polignac number, because 85662721 - 2³ = 85662713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85662121) 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, 766 + ... + 13111.

It is an arithmetic number, because the mean of its divisors is an integer number (21420693).

Almost surely, 2^85662721 is an apocalyptic number.

It is an amenable number.

85662721 is a deficient number, since it is larger than the sum of its proper divisors (20051).

85662721 is a wasteful number, since it uses less digits than its factorization.

85662721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20050.

The product of its digits is 40320, while the sum is 37.

The square root of 85662721 is about 9255.4157659178. The cubic root of 85662721 is about 440.8227049069.

The spelling of 85662721 in words is "eighty-five million, six hundred sixty-two thousand, seven hundred twenty-one".