28197138 has 16 divisors (see below), whose sum is σ = 56460096. Its totient is φ = 9388080.

The previous prime is 28197137. The next prime is 28197157. The reversal of 28197138 is 83179182.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28197096 and 28197105.

It is not an unprimeable number, because it can be changed into a prime (28197131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4168 + ... + 8588.

It is an arithmetic number, because the mean of its divisors is an integer number (3528756).

Almost surely, 2^28197138 is an apocalyptic number.

28197138 is an abundant number, since it is smaller than the sum of its proper divisors (28262958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28197138 is a wasteful number, since it uses less digits than its factorization.

28197138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5489.

The product of its digits is 24192, while the sum is 39.

The square root of 28197138 is about 5310.0977392135. The cubic root of 28197138 is about 304.3698824731.

The spelling of 28197138 in words is "twenty-eight million, one hundred ninety-seven thousand, one hundred thirty-eight".