28347138 has 16 divisors (see below), whose sum is σ = 62993760. Its totient is φ = 9449028.

The previous prime is 28347133. The next prime is 28347139. The reversal of 28347138 is 83174382.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28347131) 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, 262420 + ... + 262527.

It is an arithmetic number, because the mean of its divisors is an integer number (3937110).

Almost surely, 2^28347138 is an apocalyptic number.

28347138 is an abundant number, since it is smaller than the sum of its proper divisors (34646622).

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

28347138 is a wasteful number, since it uses less digits than its factorization.

28347138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524958 (or 524952 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 28347138 is about 5324.2030389533. The cubic root of 28347138 is about 304.9086459359.

The spelling of 28347138 in words is "twenty-eight million, three hundred forty-seven thousand, one hundred thirty-eight".