28980140 has 48 divisors (see below), whose sum is σ = 69878592. Its totient is φ = 9889536.

The previous prime is 28980137. The next prime is 28980163. The reversal of 28980140 is 4108982.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28980097 and 28980106.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44054 + ... + 44706.

It is an arithmetic number, because the mean of its divisors is an integer number (1455804).

Almost surely, 2^28980140 is an apocalyptic number.

28980140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28980140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34939296).

28980140 is an abundant number, since it is smaller than the sum of its proper divisors (40898452).

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

28980140 is a wasteful number, since it uses less digits than its factorization.

28980140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986 (or 984 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 28980140 is about 5383.3205366205. The cubic root of 28980140 is about 307.1615329755.

The spelling of 28980140 in words is "twenty-eight million, nine hundred eighty thousand, one hundred forty".