28811970 has 128 divisors (see below), whose sum is σ = 85536000. Its totient is φ = 6842880.

The previous prime is 28811969. The next prime is 28811983. The reversal of 28811970 is 7911882.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 264276 + ... + 264384.

It is an arithmetic number, because the mean of its divisors is an integer number (668250).

Almost surely, 2^28811970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28811970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42768000).

28811970 is an abundant number, since it is smaller than the sum of its proper divisors (56724030).

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

28811970 is a wasteful number, since it uses less digits than its factorization.

28811970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 28811970 is about 5367.6782690471. The cubic root of 28811970 is about 306.5662333898.

It can be divided in two parts, 2881 and 1970, that added together give a triangular number (4851 = T₉₈).

The spelling of 28811970 in words is "twenty-eight million, eight hundred eleven thousand, nine hundred seventy".