28685938 has 8 divisors (see below), whose sum is σ = 43145388. Its totient is φ = 14304144.

The previous prime is 28685929. The next prime is 28685939. The reversal of 28685938 is 83958682.

It can be written as a sum of positive squares in 2 ways, for example, as 28654609 + 31329 = 5353^2 + 177^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 28685891 and 28685900.

It is not an unprimeable number, because it can be changed into a prime (28685939) 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, 18481 + ... + 19972.

Almost surely, 2^28685938 is an apocalyptic number.

28685938 is a deficient number, since it is larger than the sum of its proper divisors (14459450).

28685938 is a wasteful number, since it uses less digits than its factorization.

28685938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38828.

The product of its digits is 829440, while the sum is 49.

The square root of 28685938 is about 5355.9255035895. The cubic root of 28685938 is about 306.1185765122.

The spelling of 28685938 in words is "twenty-eight million, six hundred eighty-five thousand, nine hundred thirty-eight".