28197201 has 8 divisors (see below), whose sum is σ = 37787904. Its totient is φ = 18702320.

The previous prime is 28197187. The next prime is 28197209. The reversal of 28197201 is 10279182.

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 28197201 - 2⁶ = 28197137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28197209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23265 + ... + 24446.

It is an arithmetic number, because the mean of its divisors is an integer number (4723488).

Almost surely, 2^28197201 is an apocalyptic number.

It is an amenable number.

28197201 is a deficient number, since it is larger than the sum of its proper divisors (9590703).

28197201 is a wasteful number, since it uses less digits than its factorization.

28197201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47911.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 28197201 is about 5310.1036713044. The cubic root of 28197201 is about 304.3701091543.

The spelling of 28197201 in words is "twenty-eight million, one hundred ninety-seven thousand, two hundred one".