28238490 has 128 divisors (see below), whose sum is σ = 87736320. Its totient is φ = 6329664.

The previous prime is 28238447. The next prime is 28238519. The reversal of 28238490 is 9483282.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 126519 + ... + 126741.

It is an arithmetic number, because the mean of its divisors is an integer number (685440).

Almost surely, 2^28238490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28238490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43868160).

28238490 is an abundant number, since it is smaller than the sum of its proper divisors (59497830).

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

28238490 is a wasteful number, since it uses less digits than its factorization.

28238490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 28238490 is about 5313.9900263361. The cubic root of 28238490 is about 304.5185991697.

The spelling of 28238490 in words is "twenty-eight million, two hundred thirty-eight thousand, four hundred ninety".