8771221778 has 16 divisors (see below), whose sum is σ = 14815906560. Its totient is φ = 3858308400.

The previous prime is 8771221777. The next prime is 8771221801.

8771221778 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×8771221778² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8771221777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6429833 + ... + 6431196.

It is an arithmetic number, because the mean of its divisors is an integer number (925994160).

Almost surely, 2^8771221778 is an apocalyptic number.

8771221778 is a deficient number, since it is larger than the sum of its proper divisors (6044684782).

8771221778 is a wasteful number, since it uses less digits than its factorization.

8771221778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12861073.

The product of its digits is 614656, while the sum is 50.

The square root of 8771221778 is about 93654.8011476187. The cubic root of 8771221778 is about 2062.3072287442.

The spelling of 8771221778 in words is "eight billion, seven hundred seventy-one million, two hundred twenty-one thousand, seven hundred seventy-eight".