28213700 has 36 divisors (see below), whose sum is σ = 62152272. Its totient is φ = 11114400.

The previous prime is 28213687. The next prime is 28213733. The reversal of 28213700 is 731282.

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 11 ways as a sum of consecutive naturals, for example, 4595 + ... + 8805.

It is an arithmetic number, because the mean of its divisors is an integer number (1726452).

Almost surely, 2^28213700 is an apocalyptic number.

28213700 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 28213700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31076136).

28213700 is an abundant number, since it is smaller than the sum of its proper divisors (33938572).

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

28213700 is a wasteful number, since it uses less digits than its factorization.

28213700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4292 (or 4285 counting only the distinct ones).

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

The square root of 28213700 is about 5311.6569919376. The cubic root of 28213700 is about 304.4294628384.

Adding to 28213700 its reverse (731282), we get a palindrome (28944982).

The spelling of 28213700 in words is "twenty-eight million, two hundred thirteen thousand, seven hundred".