28809146 has 8 divisors (see below), whose sum is σ = 43352724. Its totient is φ = 14358240.

The previous prime is 28809107. The next prime is 28809163. The reversal of 28809146 is 64190882.

It can be written as a sum of positive squares in 2 ways, for example, as 28783225 + 25921 = 5365^2 + 161^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22385 + ... + 23636.

Almost surely, 2^28809146 is an apocalyptic number.

28809146 is a deficient number, since it is larger than the sum of its proper divisors (14543578).

28809146 is a wasteful number, since it uses less digits than its factorization.

28809146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46336.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 28809146 is about 5367.4152065962. The cubic root of 28809146 is about 306.5562170513.

The spelling of 28809146 in words is "twenty-eight million, eight hundred nine thousand, one hundred forty-six".