980561820 has 96 divisors (see below), whose sum is σ = 3166732800. Its totient is φ = 222061824.

The previous prime is 980561789. The next prime is 980561839. The reversal of 980561820 is 28165089.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35071 + ... + 56489.

It is an arithmetic number, because the mean of its divisors is an integer number (32986800).

Almost surely, 2^980561820 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 980561820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1583366400).

980561820 is an abundant number, since it is smaller than the sum of its proper divisors (2186170980).

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

980561820 is a wasteful number, since it uses less digits than its factorization.

980561820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21547 (or 21545 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 980561820 is about 31313.9237400873. The cubic root of 980561820 is about 993.4781647996.

The spelling of 980561820 in words is "nine hundred eighty million, five hundred sixty-one thousand, eight hundred twenty".