28135428 has 24 divisors (see below), whose sum is σ = 69105120. Its totient is φ = 8884800.

The previous prime is 28135427. The next prime is 28135433. The reversal of 28135428 is 82453182.

It is not an unprimeable number, because it can be changed into a prime (28135427) 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, 61473 + ... + 61928.

It is an arithmetic number, because the mean of its divisors is an integer number (2879380).

Almost surely, 2^28135428 is an apocalyptic number.

It is an amenable number.

28135428 is an abundant number, since it is smaller than the sum of its proper divisors (40969692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28135428 is a wasteful number, since it uses less digits than its factorization.

28135428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123427 (or 123425 counting only the distinct ones).

The product of its digits is 15360, while the sum is 33.

The square root of 28135428 is about 5304.2839290521. The cubic root of 28135428 is about 304.1476804395.

The spelling of 28135428 in words is "twenty-eight million, one hundred thirty-five thousand, four hundred twenty-eight".