28129230 has 96 divisors (see below), whose sum is σ = 77635584. Its totient is φ = 7051968.

The previous prime is 28129229. The next prime is 28129243. The reversal of 28129230 is 3292182.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28129194 and 28129203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 221427 + ... + 221553.

It is an arithmetic number, because the mean of its divisors is an integer number (808704).

Almost surely, 2^28129230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28129230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38817792).

28129230 is an abundant number, since it is smaller than the sum of its proper divisors (49506354).

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

28129230 is a wasteful number, since it uses less digits than its factorization.

28129230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 28129230 is about 5303.6996521296. The cubic root of 28129230 is about 304.1253450674.

The spelling of 28129230 in words is "twenty-eight million, one hundred twenty-nine thousand, two hundred thirty".