28781882 has 8 divisors (see below), whose sum is σ = 43230996. Its totient is φ = 14371552.

The previous prime is 28781881. The next prime is 28781917. The reversal of 28781882 is 28818782.

It can be written as a sum of positive squares in 2 ways, for example, as 28718881 + 63001 = 5359^2 + 251^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28781881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7763 + ... + 10854.

Almost surely, 2^28781882 is an apocalyptic number.

28781882 is a deficient number, since it is larger than the sum of its proper divisors (14449114).

28781882 is a wasteful number, since it uses less digits than its factorization.

28781882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19392.

The product of its digits is 114688, while the sum is 44.

The square root of 28781882 is about 5364.8748354458. The cubic root of 28781882 is about 306.4594817224.

The spelling of 28781882 in words is "twenty-eight million, seven hundred eighty-one thousand, eight hundred eighty-two".