28138101 has 16 divisors (see below), whose sum is σ = 38548224. Its totient is φ = 18248384.

The previous prime is 28138073. The next prime is 28138127. The reversal of 28138101 is 10183182.

It is a cyclic number.

It is not a de Polignac number, because 28138101 - 2⁶ = 28138037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28138171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27271 + ... + 28283.

It is an arithmetic number, because the mean of its divisors is an integer number (2409264).

Almost surely, 2^28138101 is an apocalyptic number.

It is an amenable number.

28138101 is a deficient number, since it is larger than the sum of its proper divisors (10410123).

28138101 is a wasteful number, since it uses less digits than its factorization.

28138101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 28138101 is about 5304.5358892178. The cubic root of 28138101 is about 304.1573119618.

The spelling of 28138101 in words is "twenty-eight million, one hundred thirty-eight thousand, one hundred one".