9821428556 has 12 divisors (see below), whose sum is σ = 17741935680. Its totient is φ = 4752304080.

The previous prime is 9821428549. The next prime is 9821428597. The reversal of 9821428556 is 6558241289.

It is a happy number.

It is a super-2 number, since 2×9821428556² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39602411 + ... + 39602658.

It is an arithmetic number, because the mean of its divisors is an integer number (1478494640).

Almost surely, 2^9821428556 is an apocalyptic number.

It is an amenable number.

9821428556 is a deficient number, since it is larger than the sum of its proper divisors (7920507124).

9821428556 is a wasteful number, since it uses less digits than its factorization.

9821428556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79205104 (or 79205102 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 50.

The square root of 9821428556 is about 99103.1208186705. The cubic root of 9821428556 is about 2141.5335730588.

The spelling of 9821428556 in words is "nine billion, eight hundred twenty-one million, four hundred twenty-eight thousand, five hundred fifty-six".