28987760 has 20 divisors (see below), whose sum is σ = 67396728. Its totient is φ = 11595072.

The previous prime is 28987747. The next prime is 28987769. The reversal of 28987760 is 6778982.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28987769) 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, 181094 + ... + 181253.

Almost surely, 2^28987760 is an apocalyptic number.

28987760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28987760 is an abundant number, since it is smaller than the sum of its proper divisors (38408968).

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

28987760 is a wasteful number, since it uses less digits than its factorization.

28987760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362360 (or 362354 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 28987760 is about 5384.0282317239. The cubic root of 28987760 is about 307.1884521665.

The spelling of 28987760 in words is "twenty-eight million, nine hundred eighty-seven thousand, seven hundred sixty".