28750900 has 36 divisors (see below), whose sum is σ = 62995968. Its totient is φ = 11388640.

The previous prime is 28750889. The next prime is 28750901. The reversal of 28750900 is 905782.

It is a super-2 number, since 2×28750900² = 1653228501620000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28750901) by changing a digit.

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, 9357 + ... + 12043.

It is an arithmetic number, because the mean of its divisors is an integer number (1749888).

Almost surely, 2^28750900 is an apocalyptic number.

28750900 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 28750900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31497984).

28750900 is an abundant number, since it is smaller than the sum of its proper divisors (34245068).

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

28750900 is a wasteful number, since it uses less digits than its factorization.

28750900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808 (or 2801 counting only the distinct ones).

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

The square root of 28750900 is about 5361.9865721577. The cubic root of 28750900 is about 306.3494803849.

The spelling of 28750900 in words is "twenty-eight million, seven hundred fifty thousand, nine hundred".