28278932 has 24 divisors (see below), whose sum is σ = 54123552. Its totient is φ = 12821600.

The previous prime is 28278931. The next prime is 28278941. The reversal of 28278932 is 23987282.

It is a self number, because there is not a number n which added to its sum of digits gives 28278932.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28278931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29582 + ... + 30522.

It is an arithmetic number, because the mean of its divisors is an integer number (2255148).

Almost surely, 2^28278932 is an apocalyptic number.

28278932 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28278932 is a deficient number, since it is larger than the sum of its proper divisors (25844620).

28278932 is a wasteful number, since it uses less digits than its factorization.

28278932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639 (or 1637 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 28278932 is about 5317.7939034904. The cubic root of 28278932 is about 304.6639028159.

The spelling of 28278932 in words is "twenty-eight million, two hundred seventy-eight thousand, nine hundred thirty-two".