8721085 has 32 divisors (see below), whose sum is σ = 11819520. Its totient is φ = 6147072.

The previous prime is 8721079. The next prime is 8721101. The reversal of 8721085 is 5801278.

8721085 = T₉₄ + T₉₅ + ... + T₃₇₅.

It is a cyclic number.

It is not a de Polignac number, because 8721085 - 2³ = 8721077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 147786 + ... + 147844.

It is an arithmetic number, because the mean of its divisors is an integer number (369360).

Almost surely, 2^8721085 is an apocalyptic number.

8721085 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

8721085 is a deficient number, since it is larger than the sum of its proper divisors (3098435).

8721085 is a wasteful number, since it uses less digits than its factorization.

8721085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 8721085 is about 2953.1483200137. The cubic root of 8721085 is about 205.8370298072.

The spelling of 8721085 in words is "eight million, seven hundred twenty-one thousand, eighty-five".