28530578 has 4 divisors (see below), whose sum is σ = 42795870. Its totient is φ = 14265288.

The previous prime is 28530563. The next prime is 28530583. The reversal of 28530578 is 87503582.

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

It can be written as a sum of positive squares in only one way, i.e., 28334329 + 196249 = 5323^2 + 443^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7132643 + ... + 7132646.

Almost surely, 2^28530578 is an apocalyptic number.

28530578 is a deficient number, since it is larger than the sum of its proper divisors (14265292).

28530578 is a wasteful number, since it uses less digits than its factorization.

28530578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14265291.

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

The square root of 28530578 is about 5341.4022503459. The cubic root of 28530578 is about 305.5649405725.

The spelling of 28530578 in words is "twenty-eight million, five hundred thirty thousand, five hundred seventy-eight".