28135955 has 4 divisors (see below), whose sum is σ = 33763152. Its totient is φ = 22508760.

The previous prime is 28135937. The next prime is 28135957. The reversal of 28135955 is 55953182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55953182 = 2 ⋅27976591.

It is not a de Polignac number, because 28135955 - 2⁸ = 28135699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28135957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2813591 + ... + 2813600.

It is an arithmetic number, because the mean of its divisors is an integer number (8440788).

Almost surely, 2^28135955 is an apocalyptic number.

28135955 is a deficient number, since it is larger than the sum of its proper divisors (5627197).

28135955 is an equidigital number, since it uses as much as digits as its factorization.

28135955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5627196.

The product of its digits is 54000, while the sum is 38.

The square root of 28135955 is about 5304.3336056474. Note that the first 3 decimals coincide. The cubic root of 28135955 is about 304.1495794075.

The spelling of 28135955 in words is "twenty-eight million, one hundred thirty-five thousand, nine hundred fifty-five".