28234428 has 48 divisors (see below), whose sum is σ = 69027840. Its totient is φ = 8971200.

The previous prime is 28234421. The next prime is 28234439. The reversal of 28234428 is 82443282.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28234421) 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, 25878 + ... + 26946.

It is an arithmetic number, because the mean of its divisors is an integer number (1438080).

Almost surely, 2^28234428 is an apocalyptic number.

It is an amenable number.

28234428 is an abundant number, since it is smaller than the sum of its proper divisors (40793412).

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

28234428 is a wasteful number, since it uses less digits than its factorization.

28234428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178 (or 1176 counting only the distinct ones).

The product of its digits is 24576, while the sum is 33.

The square root of 28234428 is about 5313.6078139057. The cubic root of 28234428 is about 304.5039971865.

The spelling of 28234428 in words is "twenty-eight million, two hundred thirty-four thousand, four hundred twenty-eight".