28530551 has 8 divisors (see below), whose sum is σ = 33300480. Its totient is φ = 23934168.

The previous prime is 28530521. The next prime is 28530563. The reversal of 28530551 is 15503582.

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-28530551 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 (28530521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43031 + ... + 43688.

It is an arithmetic number, because the mean of its divisors is an integer number (4162560).

Almost surely, 2^28530551 is an apocalyptic number.

28530551 is a deficient number, since it is larger than the sum of its proper divisors (4769929).

28530551 is an equidigital number, since it uses as much as digits as its factorization.

28530551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86773.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 28530551 is about 5341.3997229191. The cubic root of 28530551 is about 305.5648441817.

The spelling of 28530551 in words is "twenty-eight million, five hundred thirty thousand, five hundred fifty-one".