28042101 has 12 divisors (see below), whose sum is σ = 41902380. Its totient is φ = 18049920.

The previous prime is 28042099. The next prime is 28042123. The reversal of 28042101 is 10124082.

It can be written as a sum of positive squares in 2 ways, for example, as 19131876 + 8910225 = 4374^2 + 2985^2 .

It is not a de Polignac number, because 28042101 - 2¹ = 28042099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28042171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53460 + ... + 53981.

It is an arithmetic number, because the mean of its divisors is an integer number (3491865).

Almost surely, 2^28042101 is an apocalyptic number.

It is an amenable number.

28042101 is a deficient number, since it is larger than the sum of its proper divisors (13860279).

28042101 is a wasteful number, since it uses less digits than its factorization.

28042101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107476 (or 107473 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 28042101 is about 5295.4792984205. The cubic root of 28042101 is about 303.8110155332.

Adding to 28042101 its reverse (10124082), we get a palindrome (38166183).

The spelling of 28042101 in words is "twenty-eight million, forty-two thousand, one hundred one".