28660121 has 16 divisors (see below), whose sum is σ = 33899904. Its totient is φ = 23721984.

The previous prime is 28660117. The next prime is 28660129. The reversal of 28660121 is 12106682.

It is a cyclic number.

It is not a de Polignac number, because 28660121 - 2² = 28660117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28660129) 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 15 ways as a sum of consecutive naturals, for example, 24281 + ... + 25433.

It is an arithmetic number, because the mean of its divisors is an integer number (2118744).

Almost surely, 2^28660121 is an apocalyptic number.

It is an amenable number.

28660121 is a deficient number, since it is larger than the sum of its proper divisors (5239783).

28660121 is a wasteful number, since it uses less digits than its factorization.

28660121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 28660121 is about 5353.5148267283. The cubic root of 28660121 is about 306.0267145999.

The spelling of 28660121 in words is "twenty-eight million, six hundred sixty thousand, one hundred twenty-one".