28530201 has 12 divisors (see below), whose sum is σ = 44251152. Its totient is φ = 16302888.

The previous prime is 28530193. The next prime is 28530221. The reversal of 28530201 is 10203582.

It is not a de Polignac number, because 28530201 - 2³ = 28530193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (28530221) 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 11 ways as a sum of consecutive naturals, for example, 96895 + ... + 97188.

It is an arithmetic number, because the mean of its divisors is an integer number (3687596).

Almost surely, 2^28530201 is an apocalyptic number.

28530201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28530201 is a deficient number, since it is larger than the sum of its proper divisors (15720951).

28530201 is a wasteful number, since it uses less digits than its factorization.

28530201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194100 (or 194093 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 28530201 is about 5341.3669598709. The cubic root of 28530201 is about 305.5635946657.

Adding to 28530201 its reverse (10203582), we get a palindrome (38733783).

The spelling of 28530201 in words is "twenty-eight million, five hundred thirty thousand, two hundred one".