28875400 has 48 divisors (see below), whose sum is σ = 67490100. Its totient is φ = 11489280.

The previous prime is 28875389. The next prime is 28875409. The reversal of 28875400 is 457882.

28875400 = T₁₆₂ + T₁₆₃ + ... + T₅₆₁.

It can be written as a sum of positive squares in 6 ways, for example, as 16016004 + 12859396 = 4002^2 + 3586^2 .

It is not an unprimeable number, because it can be changed into a prime (28875409) by changing a digit.

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, 70396 + ... + 70804.

Almost surely, 2^28875400 is an apocalyptic number.

28875400 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 28875400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33745050).

28875400 is an abundant number, since it is smaller than the sum of its proper divisors (38614700).

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

28875400 is a wasteful number, since it uses less digits than its factorization.

28875400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 769 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 28875400 is about 5373.5835342907. The cubic root of 28875400 is about 306.7910386097.

The spelling of 28875400 in words is "twenty-eight million, eight hundred seventy-five thousand, four hundred".