8220724 has 24 divisors (see below), whose sum is σ = 15526728. Its totient is φ = 3793920.

The previous prime is 8220713. The next prime is 8220727. The reversal of 8220724 is 4270228.

It can be written as a sum of positive squares in 4 ways, for example, as 3459600 + 4761124 = 1860^2 + 2182^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8220727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2464 + ... + 4744.

It is an arithmetic number, because the mean of its divisors is an integer number (646947).

Almost surely, 2^8220724 is an apocalyptic number.

It is an amenable number.

8220724 is a deficient number, since it is larger than the sum of its proper divisors (7306004).

8220724 is a wasteful number, since it uses less digits than its factorization.

8220724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355 (or 2353 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 8220724 is about 2867.1804965855. The cubic root of 8220724 is about 201.8227049378.

The spelling of 8220724 in words is "eight million, two hundred twenty thousand, seven hundred twenty-four".