28135923 has 12 divisors (see below), whose sum is σ = 39218760. Its totient is φ = 17940736.

The previous prime is 28135897. The next prime is 28135927. The reversal of 28135923 is 32953182.

It is not a de Polignac number, because 28135923 - 2¹³ = 28127731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28135927) 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, 7278 + ... + 10451.

It is an arithmetic number, because the mean of its divisors is an integer number (3268230).

Almost surely, 2^28135923 is an apocalyptic number.

28135923 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28135923 is a deficient number, since it is larger than the sum of its proper divisors (11082837).

28135923 is a wasteful number, since it uses less digits than its factorization.

28135923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17778 (or 17755 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 28135923 is about 5304.3305892450. The cubic root of 28135923 is about 304.1494641008.

The spelling of 28135923 in words is "twenty-eight million, one hundred thirty-five thousand, nine hundred twenty-three".