85721966 has 24 divisors (see below), whose sum is σ = 147489552. Its totient is φ = 37268000.

The previous prime is 85721963. The next prime is 85721969. The reversal of 85721966 is 66912758.

It is an interprime number because it is at equal distance from previous prime (85721963) and next prime (85721969).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85721963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2135 + ... + 13266.

It is an arithmetic number, because the mean of its divisors is an integer number (6145398).

Almost surely, 2^85721966 is an apocalyptic number.

85721966 is a deficient number, since it is larger than the sum of its proper divisors (61767586).

85721966 is a wasteful number, since it uses less digits than its factorization.

85721966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15448 (or 15437 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 85721966 is about 9258.6157712695. The cubic root of 85721966 is about 440.9243069510.

The spelling of 85721966 in words is "eighty-five million, seven hundred twenty-one thousand, nine hundred sixty-six".