28643882 has 8 divisors (see below), whose sum is σ = 43104036. Its totient is φ = 14275872.

The previous prime is 28643873. The next prime is 28643897. The reversal of 28643882 is 28834682.

It can be written as a sum of positive squares in 2 ways, for example, as 21520321 + 7123561 = 4639^2 + 2669^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22253 + ... + 23504.

Almost surely, 2^28643882 is an apocalyptic number.

28643882 is a deficient number, since it is larger than the sum of its proper divisors (14460154).

28643882 is a wasteful number, since it uses less digits than its factorization.

28643882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46072.

The product of its digits is 147456, while the sum is 41.

The square root of 28643882 is about 5351.9979446932. The cubic root of 28643882 is about 305.9689048101.

The spelling of 28643882 in words is "twenty-eight million, six hundred forty-three thousand, eight hundred eighty-two".