28900145 has 8 divisors (see below), whose sum is σ = 35617704. Its totient is φ = 22495104.

The previous prime is 28900139. The next prime is 28900177. The reversal of 28900145 is 54100982.

It can be written as a sum of positive squares in 4 ways, for example, as 3659569 + 25240576 = 1913^2 + 5024^2 .

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 28900145 - 2⁴ = 28900129 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77924 + ... + 78293.

It is an arithmetic number, because the mean of its divisors is an integer number (4452213).

Almost surely, 2^28900145 is an apocalyptic number.

It is an amenable number.

28900145 is a deficient number, since it is larger than the sum of its proper divisors (6717559).

28900145 is a wasteful number, since it uses less digits than its factorization.

28900145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156259.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 28900145 is about 5375.8855084535. The cubic root of 28900145 is about 306.8786492488.

The spelling of 28900145 in words is "twenty-eight million, nine hundred thousand, one hundred forty-five".