28146945 has 16 divisors (see below), whose sum is σ = 45109440. Its totient is φ = 14986944.

The previous prime is 28146941. The next prime is 28146947. The reversal of 28146945 is 54964182.

It is not a de Polignac number, because 28146945 - 2² = 28146941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28146941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11271 + ... + 13539.

It is an arithmetic number, because the mean of its divisors is an integer number (2819340).

Almost surely, 2^28146945 is an apocalyptic number.

It is an amenable number.

28146945 is a deficient number, since it is larger than the sum of its proper divisors (16962495).

28146945 is a wasteful number, since it uses less digits than its factorization.

28146945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3104.

The product of its digits is 69120, while the sum is 39.

The square root of 28146945 is about 5305.3694499064. The cubic root of 28146945 is about 304.1891748736.

The spelling of 28146945 in words is "twenty-eight million, one hundred forty-six thousand, nine hundred forty-five".