28219128 has 32 divisors (see below), whose sum is σ = 80626560. Its totient is φ = 8062560.

The previous prime is 28219073. The next prime is 28219153. The reversal of 28219128 is 82191282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83818 + ... + 84153.

It is an arithmetic number, because the mean of its divisors is an integer number (2519580).

Almost surely, 2^28219128 is an apocalyptic number.

28219128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28219128 is an abundant number, since it is smaller than the sum of its proper divisors (52407432).

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

28219128 is a wasteful number, since it uses less digits than its factorization.

28219128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167987 (or 167983 counting only the distinct ones).

The product of its digits is 4608, while the sum is 33.

The square root of 28219128 is about 5312.1679190327. The cubic root of 28219128 is about 304.4489845267.

The spelling of 28219128 in words is "twenty-eight million, two hundred nineteen thousand, one hundred twenty-eight".