28218700 has 36 divisors (see below), whose sum is σ = 63902160. Its totient is φ = 10795840.

The previous prime is 28218637. The next prime is 28218719. The reversal of 28218700 is 781282.

28218700 = T₂₇₅ + T₂₇₆ + ... + T₅₇₄.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3835 + ... + 8434.

It is an arithmetic number, because the mean of its divisors is an integer number (1775060).

Almost surely, 2^28218700 is an apocalyptic number.

28218700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28218700 is an abundant number, since it is smaller than the sum of its proper divisors (35683460).

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

28218700 is a wasteful number, since it uses less digits than its factorization.

28218700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12306 (or 12299 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 28218700 is about 5312.1276340088. The cubic root of 28218700 is about 304.4474453246.

Adding to 28218700 its reverse (781282), we get a palindrome (28999982).

The spelling of 28218700 in words is "twenty-eight million, two hundred eighteen thousand, seven hundred".