28840487 has 8 divisors (see below), whose sum is σ = 31781904. Its totient is φ = 26002368.

The previous prime is 28840481. The next prime is 28840523. The reversal of 28840487 is 78404882.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28840487 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 (28840481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25238 + ... + 26355.

It is an arithmetic number, because the mean of its divisors is an integer number (3972738).

Almost surely, 2^28840487 is an apocalyptic number.

28840487 is a deficient number, since it is larger than the sum of its proper divisors (2941417).

28840487 is a wasteful number, since it uses less digits than its factorization.

28840487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51649.

The product of its (nonzero) digits is 114688, while the sum is 41.

The square root of 28840487 is about 5370.3339747170. Note that the first 3 decimals coincide. The cubic root of 28840487 is about 306.6673425999.

The spelling of 28840487 in words is "twenty-eight million, eight hundred forty thousand, four hundred eighty-seven".