28769638 has 4 divisors (see below), whose sum is σ = 43154460. Its totient is φ = 14384818.

The previous prime is 28769633. The next prime is 28769641. The reversal of 28769638 is 83696782.

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

It is a junction number, because it is equal to n+sod(n) for n = 28769591 and 28769600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28769633) 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 as a sum of consecutive naturals, namely, 7192408 + ... + 7192411.

It is an arithmetic number, because the mean of its divisors is an integer number (10788615).

Almost surely, 2^28769638 is an apocalyptic number.

28769638 is a deficient number, since it is larger than the sum of its proper divisors (14384822).

28769638 is a wasteful number, since it uses less digits than its factorization.

28769638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14384821.

The product of its digits is 870912, while the sum is 49.

The square root of 28769638 is about 5363.7335877167. The cubic root of 28769638 is about 306.4160189390.

The spelling of 28769638 in words is "twenty-eight million, seven hundred sixty-nine thousand, six hundred thirty-eight".