28386138 has 16 divisors (see below), whose sum is σ = 61933536. Its totient is φ = 8601840.

The previous prime is 28386131. The next prime is 28386143. The reversal of 28386138 is 83168382.

It is a junction number, because it is equal to n+sod(n) for n = 28386096 and 28386105.

It is not an unprimeable number, because it can be changed into a prime (28386131) 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, 214981 + ... + 215112.

It is an arithmetic number, because the mean of its divisors is an integer number (3870846).

Almost surely, 2^28386138 is an apocalyptic number.

28386138 is an abundant number, since it is smaller than the sum of its proper divisors (33547398).

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

28386138 is a wasteful number, since it uses less digits than its factorization.

28386138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430109.

The product of its digits is 55296, while the sum is 39.

The square root of 28386138 is about 5327.8643000737. The cubic root of 28386138 is about 305.0484129904.

The spelling of 28386138 in words is "twenty-eight million, three hundred eighty-six thousand, one hundred thirty-eight".