28179138 has 16 divisors (see below), whose sum is σ = 60693696. Its totient is φ = 8670480.

The previous prime is 28179127. The next prime is 28179139. The reversal of 28179138 is 83197182.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 28179096 and 28179105.

It is not an unprimeable number, because it can be changed into a prime (28179139) 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, 180558 + ... + 180713.

It is an arithmetic number, because the mean of its divisors is an integer number (3793356).

Almost surely, 2^28179138 is an apocalyptic number.

28179138 is an abundant number, since it is smaller than the sum of its proper divisors (32514558).

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

28179138 is a wasteful number, since it uses less digits than its factorization.

28179138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361289.

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

The square root of 28179138 is about 5308.4025845823. The cubic root of 28179138 is about 304.3051025642.

The spelling of 28179138 in words is "twenty-eight million, one hundred seventy-nine thousand, one hundred thirty-eight".