28423828 has 12 divisors (see below), whose sum is σ = 51457140. Its totient is φ = 13721792.

The previous prime is 28423819. The next prime is 28423831. The reversal of 28423828 is 82832482.

It can be written as a sum of positive squares in 2 ways, for example, as 20684304 + 7739524 = 4548^2 + 2782^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122401 + ... + 122632.

It is an arithmetic number, because the mean of its divisors is an integer number (4288095).

Almost surely, 2^28423828 is an apocalyptic number.

It is an amenable number.

28423828 is a deficient number, since it is larger than the sum of its proper divisors (23033312).

28423828 is a wasteful number, since it uses less digits than its factorization.

28423828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245066 (or 245064 counting only the distinct ones).

The product of its digits is 49152, while the sum is 37.

The square root of 28423828 is about 5331.4001913193. The cubic root of 28423828 is about 305.1833637175.

It can be divided in two parts, 2842 and 3828, that added together give a triangular number (6670 = T₁₁₅).

The spelling of 28423828 in words is "twenty-eight million, four hundred twenty-three thousand, eight hundred twenty-eight".