28791270 has 96 divisors (see below), whose sum is σ = 80028000. Its totient is φ = 7160832.

The previous prime is 28791247. The next prime is 28791271. The reversal of 28791270 is 7219782.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28791271) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 193156 + ... + 193304.

It is an arithmetic number, because the mean of its divisors is an integer number (833625).

Almost surely, 2^28791270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28791270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40014000).

28791270 is an abundant number, since it is smaller than the sum of its proper divisors (51236730).

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

28791270 is a wasteful number, since it uses less digits than its factorization.

28791270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 28791270 is about 5365.7497146252. The cubic root of 28791270 is about 306.4927981546.

The spelling of 28791270 in words is "twenty-eight million, seven hundred ninety-one thousand, two hundred seventy".