28944387 has 24 divisors (see below), whose sum is σ = 44619120. Its totient is φ = 18017280.

The previous prime is 28944371. The next prime is 28944437. The reversal of 28944387 is 78344982.

It is not a de Polignac number, because 28944387 - 2⁴ = 28944371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28944367) 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 23 ways as a sum of consecutive naturals, for example, 20587 + ... + 21947.

It is an arithmetic number, because the mean of its divisors is an integer number (1859130).

Almost surely, 2^28944387 is an apocalyptic number.

28944387 is a deficient number, since it is larger than the sum of its proper divisors (15674733).

28944387 is a wasteful number, since it uses less digits than its factorization.

28944387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523 (or 1520 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 28944387 is about 5379.9987918214. The cubic root of 28944387 is about 307.0351652221.

The spelling of 28944387 in words is "twenty-eight million, nine hundred forty-four thousand, three hundred eighty-seven".