28919438 has 8 divisors (see below), whose sum is σ = 44875080. Its totient is φ = 13961080.

The previous prime is 28919399. The next prime is 28919447. The reversal of 28919438 is 83491982.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 249248 + ... + 249363.

It is an arithmetic number, because the mean of its divisors is an integer number (5609385).

Almost surely, 2^28919438 is an apocalyptic number.

28919438 is a deficient number, since it is larger than the sum of its proper divisors (15955642).

28919438 is a wasteful number, since it uses less digits than its factorization.

28919438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498642.

The product of its digits is 124416, while the sum is 44.

The square root of 28919438 is about 5377.6796111334. The cubic root of 28919438 is about 306.9469221794.

The spelling of 28919438 in words is "twenty-eight million, nine hundred nineteen thousand, four hundred thirty-eight".