28328953 has 4 divisors (see below), whose sum is σ = 29995380. Its totient is φ = 26662528.

The previous prime is 28328941. The next prime is 28329011. The reversal of 28328953 is 35982382.

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 10036224 + 18292729 = 3168^2 + 4277^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28328953 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28328933) 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 3 ways as a sum of consecutive naturals, for example, 833188 + ... + 833221.

It is an arithmetic number, because the mean of its divisors is an integer number (7498845).

Almost surely, 2^28328953 is an apocalyptic number.

It is an amenable number.

28328953 is a deficient number, since it is larger than the sum of its proper divisors (1666427).

28328953 is a wasteful number, since it uses less digits than its factorization.

28328953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666426.

The product of its digits is 103680, while the sum is 40.

The square root of 28328953 is about 5322.4949976491. The cubic root of 28328953 is about 304.8434312415.

The spelling of 28328953 in words is "twenty-eight million, three hundred twenty-eight thousand, nine hundred fifty-three".