8821428556 has 48 divisors (see below), whose sum is σ = 16577051904. Its totient is φ = 4096737216.

The previous prime is 8821428467. The next prime is 8821428557. The reversal of 8821428556 is 6558241288.

It is a super-2 number, since 2×8821428556² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8821428557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1914151 + ... + 1918753.

It is an arithmetic number, because the mean of its divisors is an integer number (345355248).

Almost surely, 2^8821428556 is an apocalyptic number.

It is an amenable number.

8821428556 is a deficient number, since it is larger than the sum of its proper divisors (7755623348).

8821428556 is a wasteful number, since it uses less digits than its factorization.

8821428556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5230 (or 5228 counting only the distinct ones).

The product of its digits is 1228800, while the sum is 49.

The square root of 8821428556 is about 93922.4603383025. The cubic root of 8821428556 is about 2066.2346507429.

The spelling of 8821428556 in words is "eight billion, eight hundred twenty-one million, four hundred twenty-eight thousand, five hundred fifty-six".