28891130 has 8 divisors (see below), whose sum is σ = 52004052. Its totient is φ = 11556448.

The previous prime is 28891129. The next prime is 28891139. The reversal of 28891130 is 3119882.

It can be written as a sum of positive squares in 2 ways, for example, as 28440889 + 450241 = 5333^2 + 671^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28891139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1444547 + ... + 1444566.

Almost surely, 2^28891130 is an apocalyptic number.

28891130 is a deficient number, since it is larger than the sum of its proper divisors (23112922).

28891130 is a wasteful number, since it uses less digits than its factorization.

28891130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2889120.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 28891130 is about 5375.0469765389. The cubic root of 28891130 is about 306.8467370821.

The spelling of 28891130 in words is "twenty-eight million, eight hundred ninety-one thousand, one hundred thirty".