28987120 has 20 divisors (see below), whose sum is σ = 67395240. Its totient is φ = 11594816.

The previous prime is 28987111. The next prime is 28987129. The reversal of 28987120 is 2178982.

It is an interprime number because it is at equal distance from previous prime (28987111) and next prime (28987129).

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 28987120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28987129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181090 + ... + 181249.

It is an arithmetic number, because the mean of its divisors is an integer number (3369762).

Almost surely, 2^28987120 is an apocalyptic number.

28987120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28987120 is an abundant number, since it is smaller than the sum of its proper divisors (38408120).

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

28987120 is a wasteful number, since it uses less digits than its factorization.

28987120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362352 (or 362346 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 28987120 is about 5383.9687963435. The cubic root of 28987120 is about 307.1861914185.

The spelling of 28987120 in words is "twenty-eight million, nine hundred eighty-seven thousand, one hundred twenty".