28489145 has 4 divisors (see below), whose sum is σ = 34186980. Its totient is φ = 22791312.

The previous prime is 28489133. The next prime is 28489147. The reversal of 28489145 is 54198482.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21827584 + 6661561 = 4672^2 + 2581^2 .

It is a cyclic number.

It is not a de Polignac number, because 28489145 - 2⁴ = 28489129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28489147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2848910 + ... + 2848919.

It is an arithmetic number, because the mean of its divisors is an integer number (8546745).

Almost surely, 2^28489145 is an apocalyptic number.

It is an amenable number.

28489145 is a deficient number, since it is larger than the sum of its proper divisors (5697835).

28489145 is an equidigital number, since it uses as much as digits as its factorization.

28489145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5697834.

The product of its digits is 92160, while the sum is 41.

The square root of 28489145 is about 5337.5223652927. The cubic root of 28489145 is about 305.4169519153.

The spelling of 28489145 in words is "twenty-eight million, four hundred eighty-nine thousand, one hundred forty-five".