28083132 has 144 divisors (see below), whose sum is σ = 91759360. Its totient is φ = 7270560.

The previous prime is 28083109. The next prime is 28083137. The reversal of 28083132 is 23138082.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28083096 and 28083105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28083137) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 91323 + ... + 91629.

Almost surely, 2^28083132 is an apocalyptic number.

28083132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28083132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45879680).

28083132 is an abundant number, since it is smaller than the sum of its proper divisors (63676228).

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

28083132 is a wasteful number, since it uses less digits than its factorization.

28083132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28083132 is about 5299.3520358625. The cubic root of 28083132 is about 303.9591213500.

The spelling of 28083132 in words is "twenty-eight million, eighty-three thousand, one hundred thirty-two".