28709500 has 48 divisors (see below), whose sum is σ = 63711648. Its totient is φ = 11299200.

The previous prime is 28709453. The next prime is 28709519. The reversal of 28709500 is 590782.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 33072 + ... + 33928.

It is an arithmetic number, because the mean of its divisors is an integer number (1327326).

Almost surely, 2^28709500 is an apocalyptic number.

28709500 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 28709500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31855824).

28709500 is an abundant number, since it is smaller than the sum of its proper divisors (35002148).

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

28709500 is a wasteful number, since it uses less digits than its factorization.

28709500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943 (or 931 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 28709500 is about 5358.1246719351. The cubic root of 28709500 is about 306.2023666024.

The spelling of 28709500 in words is "twenty-eight million, seven hundred nine thousand, five hundred".