8561245728 has 96 divisors (see below), whose sum is σ = 25699838976. Its totient is φ = 2444537088.

The previous prime is 8561245723. The next prime is 8561245733. The reversal of 8561245728 is 8275421658.

It is a Cunningham number, because it is equal to 92527²-1.

It is an interprime number because it is at equal distance from previous prime (8561245723) and next prime (8561245733).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (8561245723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1477525 + ... + 1483307.

It is an arithmetic number, because the mean of its divisors is an integer number (267706656).

Almost surely, 2^8561245728 is an apocalyptic number.

It is an amenable number.

8561245728 is an abundant number, since it is smaller than the sum of its proper divisors (17138593248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8561245728 is a wasteful number, since it uses less digits than its factorization.

8561245728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8006 (or 7998 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 48.

The square root of 8561245728 is about 92526.9999945962. Note that the first 5 decimals coincide. The cubic root of 8561245728 is about 2045.7174709660.

The spelling of 8561245728 in words is "eight billion, five hundred sixty-one million, two hundred forty-five thousand, seven hundred twenty-eight".