28706500 has 24 divisors (see below), whose sum is σ = 62696088. Its totient is φ = 11482400.

The previous prime is 28706497. The next prime is 28706543. The reversal of 28706500 is 560782.

It can be written as a sum of positive squares in 4 ways, for example, as 5531904 + 23174596 = 2352^2 + 4814^2 .

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 7 ways as a sum of consecutive naturals, for example, 28207 + ... + 29206.

It is an arithmetic number, because the mean of its divisors is an integer number (2612337).

Almost surely, 2^28706500 is an apocalyptic number.

28706500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28706500 is an abundant number, since it is smaller than the sum of its proper divisors (33989588).

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

28706500 is a wasteful number, since it uses less digits than its factorization.

28706500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57432 (or 57420 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 28706500 is about 5357.8447159282. The cubic root of 28706500 is about 306.1917006893.

The spelling of 28706500 in words is "twenty-eight million, seven hundred six thousand, five hundred".