28321612 has 24 divisors (see below), whose sum is σ = 54612432. Its totient is φ = 12744000.

The previous prime is 28321607. The next prime is 28321619. The reversal of 28321612 is 21612382.

It is a super-2 number, since 2×28321612² = 1604227412557088, which contains 22 as substring.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28321619) 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, 1258 + ... + 7630.

It is an arithmetic number, because the mean of its divisors is an integer number (2275518).

Almost surely, 2^28321612 is an apocalyptic number.

28321612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28321612 is a deficient number, since it is larger than the sum of its proper divisors (26290820).

28321612 is a wasteful number, since it uses less digits than its factorization.

28321612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6489 (or 6487 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 28321612 is about 5321.8053327795. The cubic root of 28321612 is about 304.8170971826.

Adding to 28321612 its reverse (21612382), we get a palindrome (49933994).

It can be divided in two parts, 2832 and 1612, that added together give a palindrome (4444).

The spelling of 28321612 in words is "twenty-eight million, three hundred twenty-one thousand, six hundred twelve".