28881447 has 8 divisors (see below), whose sum is σ = 44009856. Its totient is φ = 16503672.

The previous prime is 28881431. The next prime is 28881473. The reversal of 28881447 is 74418882.

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

It is not a de Polignac number, because 28881447 - 2⁴ = 28881431 is a prime.

It is a super-3 number, since 3×28881447³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28881399 and 28881408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28881407) 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 7 ways as a sum of consecutive naturals, for example, 687633 + ... + 687674.

It is an arithmetic number, because the mean of its divisors is an integer number (5501232).

Almost surely, 2^28881447 is an apocalyptic number.

28881447 is a deficient number, since it is larger than the sum of its proper divisors (15128409).

28881447 is a wasteful number, since it uses less digits than its factorization.

28881447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375317.

The product of its digits is 114688, while the sum is 42.

The square root of 28881447 is about 5374.1461647410. The cubic root of 28881447 is about 306.8124528692.

The spelling of 28881447 in words is "twenty-eight million, eight hundred eighty-one thousand, four hundred forty-seven".