28278106 has 8 divisors (see below), whose sum is σ = 44912340. Its totient is φ = 13307328.

The previous prime is 28278091. The next prime is 28278113. The reversal of 28278106 is 60187282.

It can be written as a sum of positive squares in 2 ways, for example, as 28037025 + 241081 = 5295^2 + 491^2 .

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

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: 831709 = 28278106 / (2 + 8 + 2 + 7 + 8 + 1 + 0 + 6).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415821 + ... + 415888.

Almost surely, 2^28278106 is an apocalyptic number.

28278106 is a deficient number, since it is larger than the sum of its proper divisors (16634234).

28278106 is a wasteful number, since it uses less digits than its factorization.

28278106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831728.

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

The square root of 28278106 is about 5317.7162391388. The cubic root of 28278106 is about 304.6609364753.

The spelling of 28278106 in words is "twenty-eight million, two hundred seventy-eight thousand, one hundred six".