28347638 has 32 divisors (see below), whose sum is σ = 48909312. Its totient is φ = 12298440.

The previous prime is 28347637. The next prime is 28347643. The reversal of 28347638 is 83674382.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28347595 and 28347604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28347637) 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 15 ways as a sum of consecutive naturals, for example, 60995 + ... + 61457.

It is an arithmetic number, because the mean of its divisors is an integer number (1528416).

Almost surely, 2^28347638 is an apocalyptic number.

28347638 is a deficient number, since it is larger than the sum of its proper divisors (20561674).

28347638 is a wasteful number, since it uses less digits than its factorization.

28347638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 499 counting only the distinct ones).

The product of its digits is 193536, while the sum is 41.

The square root of 28347638 is about 5324.2499941306. The cubic root of 28347638 is about 304.9104386322.

The spelling of 28347638 in words is "twenty-eight million, three hundred forty-seven thousand, six hundred thirty-eight".