28329644 has 18 divisors (see below), whose sum is σ = 57671460. Its totient is φ = 12141192.

The previous prime is 28329557. The next prime is 28329649. The reversal of 28329644 is 44692382.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28329598 and 28329607.

It is not an unprimeable number, because it can be changed into a prime (28329649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72074 + ... + 72465.

It is an arithmetic number, because the mean of its divisors is an integer number (3203970).

Almost surely, 2^28329644 is an apocalyptic number.

It is an amenable number.

28329644 is an abundant number, since it is smaller than the sum of its proper divisors (29341816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28329644 is a wasteful number, since it uses less digits than its factorization.

28329644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144557 (or 144548 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 28329644 is about 5322.5599104190. The cubic root of 28329644 is about 304.8459098024.

The spelling of 28329644 in words is "twenty-eight million, three hundred twenty-nine thousand, six hundred forty-four".