28032312 has 144 divisors (see below), whose sum is σ = 90062280. Its totient is φ = 7244160.

The previous prime is 28032311. The next prime is 28032313. The reversal of 28032312 is 21323082.

28032312 = T₁₃ + T₁₄ + ... + T₅₅₁.

It is an interprime number because it is at equal distance from previous prime (28032311) and next prime (28032313).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28032311) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 142198 + ... + 142394.

Almost surely, 2^28032312 is an apocalyptic number.

28032312 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 28032312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45031140).

28032312 is an abundant number, since it is smaller than the sum of its proper divisors (62029968).

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

28032312 is a wasteful number, since it uses less digits than its factorization.

28032312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 28032312 is about 5294.5549388027. The cubic root of 28032312 is about 303.7756597402.

Adding to 28032312 its reverse (21323082), we get a palindrome (49355394).

It can be divided in two parts, 2803 and 2312, that added together give a palindrome (5115).

The spelling of 28032312 in words is "twenty-eight million, thirty-two thousand, three hundred twelve".