28147138 has 8 divisors (see below), whose sum is σ = 44704332. Its totient is φ = 13245696.

The previous prime is 28147127. The next prime is 28147183. The reversal of 28147138 is 83174182.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 27112849 + 1034289 = 5207^2 + 1017^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28147138² = 1584522755182088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 827857 = 28147138 / (2 + 8 + 1 + 4 + 7 + 1 + 3 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413895 + ... + 413962.

Almost surely, 2^28147138 is an apocalyptic number.

28147138 is a deficient number, since it is larger than the sum of its proper divisors (16557194).

28147138 is a wasteful number, since it uses less digits than its factorization.

28147138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827876.

The product of its digits is 10752, while the sum is 34.

The square root of 28147138 is about 5305.3876389949. The cubic root of 28147138 is about 304.1898701341.

The spelling of 28147138 in words is "twenty-eight million, one hundred forty-seven thousand, one hundred thirty-eight".