28128300 has 36 divisors (see below), whose sum is σ = 81385416. Its totient is φ = 7500800.

The previous prime is 28128271. The next prime is 28128307. The reversal of 28128300 is 382182.

It is not an unprimeable number, because it can be changed into a prime (28128307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46581 + ... + 47180.

It is an arithmetic number, because the mean of its divisors is an integer number (2260706).

Almost surely, 2^28128300 is an apocalyptic number.

28128300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28128300 is an abundant number, since it is smaller than the sum of its proper divisors (53257116).

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

28128300 is a wasteful number, since it uses less digits than its factorization.

28128300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93778 (or 93771 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 28128300 is about 5303.6119767570. The cubic root of 28128300 is about 304.1219933974.

The spelling of 28128300 in words is "twenty-eight million, one hundred twenty-eight thousand, three hundred".