28888890 has 16 divisors (see below), whose sum is σ = 69333408. Its totient is φ = 7703696.

The previous prime is 28888889. The next prime is 28888891. The reversal of 28888890 is 9888882.

It is an interprime number because it is at equal distance from previous prime (28888889) and next prime (28888891).

It is not an unprimeable number, because it can be changed into a prime (28888891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481452 + ... + 481511.

It is an arithmetic number, because the mean of its divisors is an integer number (4333338).

Almost surely, 2^28888890 is an apocalyptic number.

28888890 is an abundant number, since it is smaller than the sum of its proper divisors (40444518).

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

28888890 is a wasteful number, since it uses less digits than its factorization.

28888890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962973.

The product of its (nonzero) digits is 589824, while the sum is 51.

The square root of 28888890 is about 5374.8386022280. The cubic root of 28888890 is about 306.8388066844.

The spelling of 28888890 in words is "twenty-eight million, eight hundred eighty-eight thousand, eight hundred ninety".