28890745 has 8 divisors (see below), whose sum is σ = 37335816. Its totient is φ = 21334656.

The previous prime is 28890739. The next prime is 28890751. The reversal of 28890745 is 54709882.

It is an interprime number because it is at equal distance from previous prime (28890739) and next prime (28890751).

It can be written as a sum of positive squares in 4 ways, for example, as 885481 + 28005264 = 941^2 + 5292^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28890745 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, 222172 + ... + 222301.

It is an arithmetic number, because the mean of its divisors is an integer number (4666977).

Almost surely, 2^28890745 is an apocalyptic number.

It is an amenable number.

28890745 is a deficient number, since it is larger than the sum of its proper divisors (8445071).

28890745 is a wasteful number, since it uses less digits than its factorization.

28890745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444491.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 28890745 is about 5375.0111627791. The cubic root of 28890745 is about 306.8453740742.

The spelling of 28890745 in words is "twenty-eight million, eight hundred ninety thousand, seven hundred forty-five".