8561245730 has 64 divisors (see below), whose sum is σ = 16932745440. Its totient is φ = 3102081024.

The previous prime is 8561245723. The next prime is 8561245733. The reversal of 8561245730 is 375421658.

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

It can be written as a sum of positive squares in 16 ways, for example, as 1478171809 + 7083073921 = 38447^2 + 84161^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8561245733) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1658834 + ... + 1663986.

Almost surely, 2^8561245730 is an apocalyptic number.

8561245730 is a deficient number, since it is larger than the sum of its proper divisors (8371499710).

8561245730 is a wasteful number, since it uses less digits than its factorization.

8561245730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5543.

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 8561245730 is about 92527.0000054038. Note that the first 5 decimals coincide. The cubic root of 8561245730 is about 2045.7174711253.

The spelling of 8561245730 in words is "eight billion, five hundred sixty-one million, two hundred forty-five thousand, seven hundred thirty".