28136121 has 8 divisors (see below), whose sum is σ = 40400640. Its totient is φ = 17314512.

The previous prime is 28136099. The next prime is 28136123. The reversal of 28136121 is 12163182.

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

It is not a de Polignac number, because 28136121 - 2¹⁴ = 28119737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28136091 and 28136100.

It is not an unprimeable number, because it can be changed into a prime (28136123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360681 + ... + 360758.

It is an arithmetic number, because the mean of its divisors is an integer number (5050080).

Almost surely, 2^28136121 is an apocalyptic number.

It is an amenable number.

28136121 is a deficient number, since it is larger than the sum of its proper divisors (12264519).

28136121 is a wasteful number, since it uses less digits than its factorization.

28136121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721455.

The product of its digits is 576, while the sum is 24.

The square root of 28136121 is about 5304.3492532072. The cubic root of 28136121 is about 304.1501775595.

The spelling of 28136121 in words is "twenty-eight million, one hundred thirty-six thousand, one hundred twenty-one".