28878927 has 16 divisors (see below), whose sum is σ = 48006912. Its totient is φ = 15001920.

The previous prime is 28878923. The next prime is 28878931. The reversal of 28878927 is 72987882.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28878923) and next prime (28878931).

It is not a de Polignac number, because 28878927 - 2² = 28878923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28878927.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28878923) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 62278 + ... + 62739.

It is an arithmetic number, because the mean of its divisors is an integer number (3000432).

Almost surely, 2^28878927 is an apocalyptic number.

28878927 is a deficient number, since it is larger than the sum of its proper divisors (19127985).

28878927 is a wasteful number, since it uses less digits than its factorization.

28878927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125038.

The product of its digits is 903168, while the sum is 51.

The square root of 28878927 is about 5373.9117037778. The cubic root of 28878927 is about 306.8035291489.

The spelling of 28878927 in words is "twenty-eight million, eight hundred seventy-eight thousand, nine hundred twenty-seven".