8721733 has 12 divisors (see below), whose sum is σ = 9199980. Its totient is φ = 8264256.

The previous prime is 8721701. The next prime is 8721737. The reversal of 8721733 is 3371278.

It can be written as a sum of positive squares in 2 ways, for example, as 3912484 + 4809249 = 1978^2 + 2193^2 .

It is not a de Polignac number, because 8721733 - 2⁵ = 8721701 is a prime.

It is a Duffinian number.

8721733 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 8721695 and 8721704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721737) 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, 97953 + ... + 98041.

It is an arithmetic number, because the mean of its divisors is an integer number (766665).

Almost surely, 2^8721733 is an apocalyptic number.

It is an amenable number.

8721733 is a deficient number, since it is larger than the sum of its proper divisors (478247).

8721733 is an equidigital number, since it uses as much as digits as its factorization.

8721733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 185 counting only the distinct ones).

The product of its digits is 7056, while the sum is 31.

The square root of 8721733 is about 2953.2580313952. The cubic root of 8721733 is about 205.8421277620.

The spelling of 8721733 in words is "eight million, seven hundred twenty-one thousand, seven hundred thirty-three".