28228970 has 64 divisors (see below), whose sum is σ = 64495872. Its totient is φ = 8640000.

The previous prime is 28228969. The next prime is 28228973. The reversal of 28228970 is 7982282.

It is not an unprimeable number, because it can be changed into a prime (28228973) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46670 + ... + 47270.

It is an arithmetic number, because the mean of its divisors is an integer number (1007748).

Almost surely, 2^28228970 is an apocalyptic number.

28228970 is an abundant number, since it is smaller than the sum of its proper divisors (36266902).

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

28228970 is a wasteful number, since it uses less digits than its factorization.

28228970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28228970 is about 5313.0942020634. The cubic root of 28228970 is about 304.4843746897.

The spelling of 28228970 in words is "twenty-eight million, two hundred twenty-eight thousand, nine hundred seventy".