8572721 has 8 divisors (see below), whose sum is σ = 8995200. Its totient is φ = 8154432.

The previous prime is 8572699. The next prime is 8572727. The reversal of 8572721 is 1272758.

8572721 is nontrivially palindromic in base 6.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8572721 - 2⁶ = 8572657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8572727) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3641 + ... + 5513.

It is an arithmetic number, because the mean of its divisors is an integer number (1124400).

Almost surely, 2^8572721 is an apocalyptic number.

It is an amenable number.

8572721 is a deficient number, since it is larger than the sum of its proper divisors (422479).

8572721 is a wasteful number, since it uses less digits than its factorization.

8572721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2095.

The product of its digits is 7840, while the sum is 32.

The square root of 8572721 is about 2927.9209347248. The cubic root of 8572721 is about 204.6631071800.

The spelling of 8572721 in words is "eight million, five hundred seventy-two thousand, seven hundred twenty-one".