28271138 has 12 divisors (see below), whose sum is σ = 49330422. Its totient is φ = 12116160.

The previous prime is 28271137. The next prime is 28271179. The reversal of 28271138 is 83117282.

It can be written as a sum of positive squares in only one way, i.e., 25472209 + 2798929 = 5047^2 + 1673^2 .

It is not an unprimeable number, because it can be changed into a prime (28271137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 144143 + ... + 144338.

Almost surely, 2^28271138 is an apocalyptic number.

28271138 is a deficient number, since it is larger than the sum of its proper divisors (21059284).

28271138 is a wasteful number, since it uses less digits than its factorization.

28271138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288497 (or 288490 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 28271138 is about 5317.0610303061. The cubic root of 28271138 is about 304.6359106150.

The spelling of 28271138 in words is "twenty-eight million, two hundred seventy-one thousand, one hundred thirty-eight".