28300000 has 72 divisors (see below), whose sum is σ = 69886152. Its totient is φ = 11280000.

The previous prime is 28299979. The next prime is 28300001. The reversal of 28300000 is 382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28300001) 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, 99859 + ... + 100141.

It is an arithmetic number, because the mean of its divisors is an integer number (970641).

Almost surely, 2^28300000 is an apocalyptic number.

28300000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28300000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34943076).

28300000 is an abundant number, since it is smaller than the sum of its proper divisors (41586152).

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

28300000 is an frugal number, since it uses more digits than its factorization.

28300000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 28300000 is about 5319.7744313082. The cubic root of 28300000 is about 304.7395429401.

Adding to 28300000 its reverse (382), we get a palindrome (28300382).

The spelling of 28300000 in words is "twenty-eight million, three hundred thousand".