28293900 has 72 divisors (see below), whose sum is σ = 84109200. Its totient is φ = 7338240.

The previous prime is 28293827. The next prime is 28293911. The reversal of 28293900 is 939282.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9826 + ... + 12374.

Almost surely, 2^28293900 is an apocalyptic number.

28293900 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 28293900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42054600).

28293900 is an abundant number, since it is smaller than the sum of its proper divisors (55815300).

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

28293900 is a wasteful number, since it uses less digits than its factorization.

28293900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2603 (or 2596 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 28293900 is about 5319.2010678296. The cubic root of 28293900 is about 304.7176460639.

The spelling of 28293900 in words is "twenty-eight million, two hundred ninety-three thousand, nine hundred".