28640883 has 4 divisors (see below), whose sum is σ = 38187848. Its totient is φ = 19093920.

The previous prime is 28640863. The next prime is 28640917. The reversal of 28640883 is 38804682.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28640883 - 2¹² = 28636787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28640863) 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 3 ways as a sum of consecutive naturals, for example, 4773478 + ... + 4773483.

It is an arithmetic number, because the mean of its divisors is an integer number (9546962).

Almost surely, 2^28640883 is an apocalyptic number.

28640883 is a deficient number, since it is larger than the sum of its proper divisors (9546965).

28640883 is an equidigital number, since it uses as much as digits as its factorization.

28640883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9546964.

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 28640883 is about 5351.7177616164. The cubic root of 28640883 is about 305.9582261741.

The spelling of 28640883 in words is "twenty-eight million, six hundred forty thousand, eight hundred eighty-three".