28231700 has 72 divisors (see below), whose sum is σ = 72328704. Its totient is φ = 9360000.

The previous prime is 28231699. The next prime is 28231733. The reversal of 28231700 is 713282.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21050 + ... + 22350.

Almost surely, 2^28231700 is an apocalyptic number.

28231700 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 28231700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36164352).

28231700 is an abundant number, since it is smaller than the sum of its proper divisors (44097004).

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

28231700 is a wasteful number, since it uses less digits than its factorization.

28231700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353 (or 1346 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 28231700 is about 5313.3511082931. The cubic root of 28231700 is about 304.4941898494.

Adding to 28231700 its reverse (713282), we get a palindrome (28944982).

The spelling of 28231700 in words is "twenty-eight million, two hundred thirty-one thousand, seven hundred".