28090612 has 12 divisors (see below), whose sum is σ = 53627616. Its totient is φ = 12768440.

The previous prime is 28090609. The next prime is 28090627. The reversal of 28090612 is 21609082.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319168 + ... + 319255.

It is an arithmetic number, because the mean of its divisors is an integer number (4468968).

Almost surely, 2^28090612 is an apocalyptic number.

28090612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28090612 is a deficient number, since it is larger than the sum of its proper divisors (25537004).

28090612 is a wasteful number, since it uses less digits than its factorization.

28090612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638438 (or 638436 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 28090612 is about 5300.0577355346. The cubic root of 28090612 is about 303.9861056669.

Adding to 28090612 its reverse (21609082), we get a palindrome (49699694).

The spelling of 28090612 in words is "twenty-eight million, ninety thousand, six hundred twelve".