28951230 has 128 divisors (see below), whose sum is σ = 88252416. Its totient is φ = 5904000.

The previous prime is 28951229. The next prime is 28951243. The reversal of 28951230 is 3215982.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

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, 191655 + ... + 191805.

It is an arithmetic number, because the mean of its divisors is an integer number (689472).

Almost surely, 2^28951230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28951230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44126208).

28951230 is an abundant number, since it is smaller than the sum of its proper divisors (59301186).

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

28951230 is a wasteful number, since it uses less digits than its factorization.

28951230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 28951230 is about 5380.6347209228. The cubic root of 28951230 is about 307.0593596204.

The spelling of 28951230 in words is "twenty-eight million, nine hundred fifty-one thousand, two hundred thirty".