28878101 has 6 divisors (see below), whose sum is σ = 33592950. Its totient is φ = 24752616.

The previous prime is 28878077. The next prime is 28878127. The reversal of 28878101 is 10187882.

It can be written as a sum of positive squares in only one way, i.e., 18054001 + 10824100 = 4249^2 + 3290^2 .

It is not a de Polignac number, because 28878101 - 2¹⁰ = 28877077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28878151) 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, 294626 + ... + 294723.

It is an arithmetic number, because the mean of its divisors is an integer number (5598825).

Almost surely, 2^28878101 is an apocalyptic number.

It is an amenable number.

28878101 is a deficient number, since it is larger than the sum of its proper divisors (4714849).

28878101 is an equidigital number, since it uses as much as digits as its factorization.

28878101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589363 (or 589356 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 35.

The square root of 28878101 is about 5373.8348504583. The cubic root of 28878101 is about 306.8006040387.

The spelling of 28878101 in words is "twenty-eight million, eight hundred seventy-eight thousand, one hundred one".