85544721 has 8 divisors (see below), whose sum is σ = 126732960. Its totient is φ = 57029796.

The previous prime is 85544713. The next prime is 85544743. The reversal of 85544721 is 12744558.

It is not a de Polignac number, because 85544721 - 2³ = 85544713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85544761) 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, 1584135 + ... + 1584188.

It is an arithmetic number, because the mean of its divisors is an integer number (15841620).

Almost surely, 2^85544721 is an apocalyptic number.

It is an amenable number.

85544721 is a deficient number, since it is larger than the sum of its proper divisors (41188239).

85544721 is a wasteful number, since it uses less digits than its factorization.

85544721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3168332 (or 3168326 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 85544721 is about 9249.0389230449. The cubic root of 85544721 is about 440.6202014869.

The spelling of 85544721 in words is "eighty-five million, five hundred forty-four thousand, seven hundred twenty-one".