28530587 has 4 divisors (see below), whose sum is σ = 28797336. Its totient is φ = 28263840.

The previous prime is 28530583. The next prime is 28530599. The reversal of 28530587 is 78503582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28530587 - 2² = 28530583 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28530587.

It is not an unprimeable number, because it can be changed into a prime (28530583) 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, 133214 + ... + 133427.

It is an arithmetic number, because the mean of its divisors is an integer number (7199334).

Almost surely, 2^28530587 is an apocalyptic number.

28530587 is a deficient number, since it is larger than the sum of its proper divisors (266749).

28530587 is a wasteful number, since it uses less digits than its factorization.

28530587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266748.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 28530587 is about 5341.4030928212. The cubic root of 28530587 is about 305.5649727027.

The spelling of 28530587 in words is "twenty-eight million, five hundred thirty thousand, five hundred eighty-seven".