28132644 has 12 divisors (see below), whose sum is σ = 65642864. Its totient is φ = 9377544.

The previous prime is 28132631. The next prime is 28132661. The reversal of 28132644 is 44623182.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1172182 + ... + 1172205.

Almost surely, 2^28132644 is an apocalyptic number.

It is an amenable number.

28132644 is an abundant number, since it is smaller than the sum of its proper divisors (37510220).

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

28132644 is a wasteful number, since it uses less digits than its factorization.

28132644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344394 (or 2344392 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 28132644 is about 5304.0214931691. The cubic root of 28132644 is about 304.1376483065.

The spelling of 28132644 in words is "twenty-eight million, one hundred thirty-two thousand, six hundred forty-four".