28756138 has 8 divisors (see below), whose sum is σ = 43420320. Its totient is φ = 14282700.

The previous prime is 28756103. The next prime is 28756153. The reversal of 28756138 is 83165782.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28756138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47308 + ... + 47911.

It is an arithmetic number, because the mean of its divisors is an integer number (5427540).

Almost surely, 2^28756138 is an apocalyptic number.

28756138 is a deficient number, since it is larger than the sum of its proper divisors (14664182).

28756138 is a wasteful number, since it uses less digits than its factorization.

28756138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95372.

The product of its digits is 80640, while the sum is 40.

The square root of 28756138 is about 5362.4749882867. The cubic root of 28756138 is about 306.3680834100.

The spelling of 28756138 in words is "twenty-eight million, seven hundred fifty-six thousand, one hundred thirty-eight".