28349938 has 32 divisors (see below), whose sum is σ = 47232000. Its totient is φ = 12702096.

The previous prime is 28349929. The next prime is 28349987. The reversal of 28349938 is 83994382.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

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, 142363 + ... + 142561.

It is an arithmetic number, because the mean of its divisors is an integer number (1476000).

Almost surely, 2^28349938 is an apocalyptic number.

28349938 is a deficient number, since it is larger than the sum of its proper divisors (18882062).

28349938 is a wasteful number, since it uses less digits than its factorization.

28349938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406.

The product of its digits is 373248, while the sum is 46.

The square root of 28349938 is about 5324.4659826127. The cubic root of 28349938 is about 304.9186847636.

The spelling of 28349938 in words is "twenty-eight million, three hundred forty-nine thousand, nine hundred thirty-eight".