28439500 has 48 divisors (see below), whose sum is σ = 64838592. Its totient is φ = 10876800.

The previous prime is 28439497. The next prime is 28439503. The reversal of 28439500 is 593482.

It is an interprime number because it is at equal distance from previous prime (28439497) and next prime (28439503).

It is not an unprimeable number, because it can be changed into a prime (28439503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10264 + ... + 12736.

It is an arithmetic number, because the mean of its divisors is an integer number (1350804).

Almost surely, 2^28439500 is an apocalyptic number.

28439500 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 28439500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32419296).

28439500 is an abundant number, since it is smaller than the sum of its proper divisors (36399092).

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

28439500 is a wasteful number, since it uses less digits than its factorization.

28439500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515 (or 2503 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 28439500 is about 5332.8697715208. The cubic root of 28439500 is about 305.2394428977.

The spelling of 28439500 in words is "twenty-eight million, four hundred thirty-nine thousand, five hundred".