28121045 has 8 divisors (see below), whose sum is σ = 35521440. Its totient is φ = 21312720.

The previous prime is 28121033. The next prime is 28121047. The reversal of 28121045 is 54012182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28121045 - 2⁴ = 28121029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28121045.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28121047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147911 + ... + 148100.

It is an arithmetic number, because the mean of its divisors is an integer number (4440180).

Almost surely, 2^28121045 is an apocalyptic number.

It is an amenable number.

28121045 is a deficient number, since it is larger than the sum of its proper divisors (7400395).

28121045 is a wasteful number, since it uses less digits than its factorization.

28121045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296035.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 28121045 is about 5302.9279648134. The cubic root of 28121045 is about 304.0958442311.

The spelling of 28121045 in words is "twenty-eight million, one hundred twenty-one thousand, forty-five".