8720243684 has 6 divisors (see below), whose sum is σ = 15260426454. Its totient is φ = 4360121840.

The previous prime is 8720243683. The next prime is 8720243699. The reversal of 8720243684 is 4863420278.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5674307584 + 3045936100 = 75328^2 + 55190^2 .

It is not an unprimeable number, because it can be changed into a prime (8720243681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090030457 + ... + 1090030464.

It is an arithmetic number, because the mean of its divisors is an integer number (2543404409).

Almost surely, 2^8720243684 is an apocalyptic number.

It is an amenable number.

8720243684 is a deficient number, since it is larger than the sum of its proper divisors (6540182770).

8720243684 is a wasteful number, since it uses less digits than its factorization.

8720243684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180060925 (or 2180060923 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 44.

The square root of 8720243684 is about 93382.2450147778. The cubic root of 8720243684 is about 2058.3041061718.

The spelling of 8720243684 in words is "eight billion, seven hundred twenty million, two hundred forty-three thousand, six hundred eighty-four".