85721073 has 16 divisors (see below), whose sum is σ = 116390976. Its totient is φ = 56105280.

The previous prime is 85721047. The next prime is 85721081. The reversal of 85721073 is 37012758.

It is not a de Polignac number, because 85721073 - 2¹² = 85716977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85721173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84115 + ... + 85127.

It is an arithmetic number, because the mean of its divisors is an integer number (7274436).

Almost surely, 2^85721073 is an apocalyptic number.

It is an amenable number.

85721073 is a deficient number, since it is larger than the sum of its proper divisors (30669903).

85721073 is a wasteful number, since it uses less digits than its factorization.

85721073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 85721073 is about 9258.5675457924. The cubic root of 85721073 is about 440.9227758507.

The spelling of 85721073 in words is "eighty-five million, seven hundred twenty-one thousand, seventy-three".