28197938 has 16 divisors (see below), whose sum is σ = 45561120. Its totient is φ = 13045536.

The previous prime is 28197913. The next prime is 28197943. The reversal of 28197938 is 83979182.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28197892 and 28197901.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6995 + ... + 10262.

It is an arithmetic number, because the mean of its divisors is an integer number (2847570).

Almost surely, 2^28197938 is an apocalyptic number.

28197938 is a deficient number, since it is larger than the sum of its proper divisors (17363182).

28197938 is a wasteful number, since it uses less digits than its factorization.

28197938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17321.

The product of its digits is 217728, while the sum is 47.

The square root of 28197938 is about 5310.1730668595. The cubic root of 28197938 is about 304.3727609402.

The spelling of 28197938 in words is "twenty-eight million, one hundred ninety-seven thousand, nine hundred thirty-eight".