28819388 has 36 divisors (see below), whose sum is σ = 56336280. Its totient is φ = 12823104.

The previous prime is 28819381. The next prime is 28819393. The reversal of 28819388 is 88391882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28819381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43403 + ... + 44061.

Almost surely, 2^28819388 is an apocalyptic number.

It is an amenable number.

28819388 is a deficient number, since it is larger than the sum of its proper divisors (27516892).

28819388 is a wasteful number, since it uses less digits than its factorization.

28819388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734 (or 703 counting only the distinct ones).

The product of its digits is 221184, while the sum is 47.

The square root of 28819388 is about 5368.3692123400. The cubic root of 28819388 is about 306.5925408953.

The spelling of 28819388 in words is "twenty-eight million, eight hundred nineteen thousand, three hundred eighty-eight".