8571220642 has 24 divisors (see below), whose sum is σ = 13195278468. Its totient is φ = 4175623680.

The previous prime is 8571220639. The next prime is 8571220643. The reversal of 8571220642 is 2460221758.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 28100601 + 8543120041 = 5301^2 + 92429^2 .

It is not an unprimeable number, because it can be changed into a prime (8571220643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4009798 + ... + 4011934.

Almost surely, 2^8571220642 is an apocalyptic number.

8571220642 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

8571220642 is a deficient number, since it is larger than the sum of its proper divisors (4624057826).

8571220642 is a wasteful number, since it uses less digits than its factorization.

8571220642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3414 (or 3373 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 8571220642 is about 92580.8870231864. The cubic root of 8571220642 is about 2046.5116675310.

The spelling of 8571220642 in words is "eight billion, five hundred seventy-one million, two hundred twenty thousand, six hundred forty-two".