8723281 has 16 divisors (see below), whose sum is σ = 10367104. Its totient is φ = 7185024.

The previous prime is 8723243. The next prime is 8723303. The reversal of 8723281 is 1823278.

It is not a de Polignac number, because 8723281 - 2¹⁷ = 8592209 is a prime.

It is a super-2 number, since 2×8723281² = 152191262809922, which contains 22 as substring.

It is a Duffinian number.

8723281 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8723081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21775 + ... + 22171.

It is an arithmetic number, because the mean of its divisors is an integer number (647944).

Almost surely, 2^8723281 is an apocalyptic number.

It is an amenable number.

8723281 is a deficient number, since it is larger than the sum of its proper divisors (1643823).

8723281 is a wasteful number, since it uses less digits than its factorization.

8723281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520.

The product of its digits is 5376, while the sum is 31.

The square root of 8723281 is about 2953.5201031989. The cubic root of 8723281 is about 205.8543051876.

The spelling of 8723281 in words is "eight million, seven hundred twenty-three thousand, two hundred eighty-one".