28331612 has 12 divisors (see below), whose sum is σ = 50208480. Its totient is φ = 13986336.

The previous prime is 28331609. The next prime is 28331617. The reversal of 28331612 is 21613382.

It is a super-3 number, since 3×28331612³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28331617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44513 + ... + 45144.

It is an arithmetic number, because the mean of its divisors is an integer number (4184040).

Almost surely, 2^28331612 is an apocalyptic number.

It is an amenable number.

28331612 is a deficient number, since it is larger than the sum of its proper divisors (21876868).

28331612 is a wasteful number, since it uses less digits than its factorization.

28331612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89740 (or 89738 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 28331612 is about 5322.7447806559. The cubic root of 28331612 is about 304.8529686375.

Adding to 28331612 its reverse (21613382), we get a palindrome (49944994).

The spelling of 28331612 in words is "twenty-eight million, three hundred thirty-one thousand, six hundred twelve".