28329945 has 32 divisors (see below), whose sum is σ = 52589568. Its totient is φ = 12754368.

The previous prime is 28329919. The next prime is 28329947. The reversal of 28329945 is 54992382.

It is not a de Polignac number, because 28329945 - 2⁸ = 28329689 is a prime.

It is a super-3 number, since 3×28329945³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28329897 and 28329906.

It is not an unprimeable number, because it can be changed into a prime (28329947) 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 31 ways as a sum of consecutive naturals, for example, 5022 + ... + 9048.

It is an arithmetic number, because the mean of its divisors is an integer number (1643424).

Almost surely, 2^28329945 is an apocalyptic number.

It is an amenable number.

28329945 is a deficient number, since it is larger than the sum of its proper divisors (24259623).

28329945 is a wasteful number, since it uses less digits than its factorization.

28329945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109.

The product of its digits is 155520, while the sum is 42.

The square root of 28329945 is about 5322.5881862117. The cubic root of 28329945 is about 304.8469894523.

The spelling of 28329945 in words is "twenty-eight million, three hundred twenty-nine thousand, nine hundred forty-five".