28872270 has 72 divisors (see below), whose sum is σ = 87337224. Its totient is φ = 6598368.

The previous prime is 28872251. The next prime is 28872271. The reversal of 28872270 is 7227882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28872271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1137 + ... + 7683.

It is an arithmetic number, because the mean of its divisors is an integer number (1213017).

Almost surely, 2^28872270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28872270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43668612).

28872270 is an abundant number, since it is smaller than the sum of its proper divisors (58464954).

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

28872270 is a wasteful number, since it uses less digits than its factorization.

28872270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6574 (or 6564 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 28872270 is about 5373.2922868573. The cubic root of 28872270 is about 306.7799531570.

The spelling of 28872270 in words is "twenty-eight million, eight hundred seventy-two thousand, two hundred seventy".