9980028 has 18 divisors (see below), whose sum is σ = 25227384. Its totient is φ = 3326664.

The previous prime is 9980021. The next prime is 9980029. The reversal of 9980028 is 8200899.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 277223 = 9980028 / (9 + 9 + 8 + 0 + 0 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 9979974 and 9980001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9980021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 138576 + ... + 138647.

Almost surely, 2^9980028 is an apocalyptic number.

It is an amenable number.

9980028 is an abundant number, since it is smaller than the sum of its proper divisors (15247356).

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

9980028 is a wasteful number, since it uses less digits than its factorization.

9980028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277233 (or 277228 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 9980028 is about 3159.1182314057. The cubic root of 9980028 is about 215.2999455136.

The spelling of 9980028 in words is "nine million, nine hundred eighty thousand, twenty-eight".