28980216 has 24 divisors (see below), whose sum is σ = 78488280. Its totient is φ = 9660048.

The previous prime is 28980199. The next prime is 28980221. The reversal of 28980216 is 61208982.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 201180 + ... + 201323.

It is an arithmetic number, because the mean of its divisors is an integer number (3270345).

Almost surely, 2^28980216 is an apocalyptic number.

It is an amenable number.

28980216 is an abundant number, since it is smaller than the sum of its proper divisors (49508064).

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

28980216 is a wasteful number, since it uses less digits than its factorization.

28980216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402515 (or 402508 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 28980216 is about 5383.3275954562. The cubic root of 28980216 is about 307.1618014842.

The spelling of 28980216 in words is "twenty-eight million, nine hundred eighty thousand, two hundred sixteen".