8981572820 has 24 divisors (see below), whose sum is σ = 20575967328. Its totient is φ = 3266026400.

The previous prime is 8981572813. The next prime is 8981572823. The reversal of 8981572820 is 282751898.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8981572823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20412446 + ... + 20412885.

It is an arithmetic number, because the mean of its divisors is an integer number (857331972).

Almost surely, 2^8981572820 is an apocalyptic number.

It is an amenable number.

8981572820 is an abundant number, since it is smaller than the sum of its proper divisors (11594394508).

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

8981572820 is a wasteful number, since it uses less digits than its factorization.

8981572820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40825351 (or 40825349 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 50.

The square root of 8981572820 is about 94771.1602756872. The cubic root of 8981572820 is about 2078.6632205095.

The spelling of 8981572820 in words is "eight billion, nine hundred eighty-one million, five hundred seventy-two thousand, eight hundred twenty".