28890500 has 24 divisors (see below), whose sum is σ = 63097944. Its totient is φ = 11556000.

The previous prime is 28890493. The next prime is 28890503. The reversal of 28890500 is 509882.

It can be written as a sum of positive squares in 4 ways, for example, as 75076 + 28815424 = 274^2 + 5368^2 .

It is not an unprimeable number, because it can be changed into a prime (28890503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28391 + ... + 29390.

It is an arithmetic number, because the mean of its divisors is an integer number (2629081).

Almost surely, 2^28890500 is an apocalyptic number.

28890500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28890500 is an abundant number, since it is smaller than the sum of its proper divisors (34207444).

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

28890500 is a wasteful number, since it uses less digits than its factorization.

28890500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57800 (or 57788 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 28890500 is about 5374.9883720804. The cubic root of 28890500 is about 306.8445066992.

The spelling of 28890500 in words is "twenty-eight million, eight hundred ninety thousand, five hundred".