28530787 has 8 divisors (see below), whose sum is σ = 29917440. Its totient is φ = 27156360.

The previous prime is 28530769. The next prime is 28530791. The reversal of 28530787 is 78703582.

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

It is a cyclic number.

It is not a de Polignac number, because 28530787 - 2⁷ = 28530659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28530767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1914 + ... + 7792.

It is an arithmetic number, because the mean of its divisors is an integer number (3739680).

Almost surely, 2^28530787 is an apocalyptic number.

28530787 is a deficient number, since it is larger than the sum of its proper divisors (1386653).

28530787 is a wasteful number, since it uses less digits than its factorization.

28530787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6113.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 28530787 is about 5341.4218144610. The cubic root of 28530787 is about 305.5656867066.

The spelling of 28530787 in words is "twenty-eight million, five hundred thirty thousand, seven hundred eighty-seven".