8561020140 has 384 divisors, whose sum is σ = 29611008000. Its totient is φ = 2043740160.

The previous prime is 8561020103. The next prime is 8561020201. The reversal of 8561020140 is 410201658.

8561020140 is a `hidden beast` number, since 8 + 5 + 610 + 2 + 0 + 1 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 19066636 + ... + 19067084.

It is an arithmetic number, because the mean of its divisors is an integer number (77112000).

Almost surely, 2^8561020140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8561020140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14805504000).

8561020140 is an abundant number, since it is smaller than the sum of its proper divisors (21049987860).

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

8561020140 is a wasteful number, since it uses less digits than its factorization.

8561020140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 8561020140 is about 92525.7809477985. The cubic root of 8561020140 is about 2045.6995026554.

Adding to 8561020140 its reverse (410201658), we get a palindrome (8971221798).

The spelling of 8561020140 in words is "eight billion, five hundred sixty-one million, twenty thousand, one hundred forty".