28891928 has 32 divisors (see below), whose sum is σ = 58573200. Its totient is φ = 13281408.

The previous prime is 28891927. The next prime is 28891939. The reversal of 28891928 is 82919882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28891927) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 39050 + ... + 39782.

Almost surely, 2^28891928 is an apocalyptic number.

It is an amenable number.

28891928 is an abundant number, since it is smaller than the sum of its proper divisors (29681272).

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

28891928 is a wasteful number, since it uses less digits than its factorization.

28891928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131 (or 1127 counting only the distinct ones).

The product of its digits is 165888, while the sum is 47.

The square root of 28891928 is about 5375.1212079357. The cubic root of 28891928 is about 306.8495621873.

The spelling of 28891928 in words is "twenty-eight million, eight hundred ninety-one thousand, nine hundred twenty-eight".