8657220780 has 144 divisors (see below), whose sum is σ = 29044876224. Its totient is φ = 2073392640.

The previous prime is 8657220779. The next prime is 8657220787. The reversal of 8657220780 is 870227568.

8657220780 is a `hidden beast` number, since 8 + 6 + 572 + 2 + 0 + 78 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (8657220787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36585 + ... + 136575.

Almost surely, 2^8657220780 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 8657220780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14522438112).

8657220780 is an abundant number, since it is smaller than the sum of its proper divisors (20387655444).

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

8657220780 is a wasteful number, since it uses less digits than its factorization.

8657220780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100056 (or 100051 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 8657220780 is about 93044.1872445560. The cubic root of 8657220780 is about 2053.3335238400. Note that the first 3 decimals are identical.

The spelling of 8657220780 in words is "eight billion, six hundred fifty-seven million, two hundred twenty thousand, seven hundred eighty".