28731300 has 144 divisors (see below), whose sum is σ = 91869120. Its totient is φ = 6888960.

The previous prime is 28731299. The next prime is 28731317. The reversal of 28731300 is 313782.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 206631 + ... + 206769.

It is an arithmetic number, because the mean of its divisors is an integer number (637980).

Almost surely, 2^28731300 is an apocalyptic number.

28731300 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 28731300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45934560).

28731300 is an abundant number, since it is smaller than the sum of its proper divisors (63137820).

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

28731300 is a wasteful number, since it uses less digits than its factorization.

28731300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 28731300 is about 5360.1585797437. The cubic root of 28731300 is about 306.2798499296.

The spelling of 28731300 in words is "twenty-eight million, seven hundred thirty-one thousand, three hundred".