28680287 has 8 divisors (see below), whose sum is σ = 30145920. Its totient is φ = 27232920.

The previous prime is 28680277. The next prime is 28680299. The reversal of 28680287 is 78208682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28680287 - 2⁴ = 28680271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28680257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1289 + ... + 7682.

It is an arithmetic number, because the mean of its divisors is an integer number (3768240).

Almost surely, 2^28680287 is an apocalyptic number.

28680287 is a deficient number, since it is larger than the sum of its proper divisors (1465633).

28680287 is a wasteful number, since it uses less digits than its factorization.

28680287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9133.

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 28680287 is about 5355.3979310598. The cubic root of 28680287 is about 306.0984738673.

The spelling of 28680287 in words is "twenty-eight million, six hundred eighty thousand, two hundred eighty-seven".