28197000 has 192 divisors, whose sum is σ = 103062960. Its totient is φ = 6912000.

The previous prime is 28196989. The next prime is 28197031. The reversal of 28197000 is 79182.

It can be written as a sum of positive squares in 8 ways, for example, as 381924 + 27815076 = 618^2 + 5274^2 .

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, 116880 + ... + 117120.

Almost surely, 2^28197000 is an apocalyptic number.

28197000 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 28197000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51531480).

28197000 is an abundant number, since it is smaller than the sum of its proper divisors (74865960).

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

28197000 is a wasteful number, since it uses less digits than its factorization.

28197000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 28197000 is about 5310.0847450865. The cubic root of 28197000 is about 304.3693859320.

The spelling of 28197000 in words is "twenty-eight million, one hundred ninety-seven thousand".