28277812 has 12 divisors (see below), whose sum is σ = 49700196. Its totient is φ = 14077760.

The previous prime is 28277807. The next prime is 28277827. The reversal of 28277812 is 21877282.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5180176 + 23097636 = 2276^2 + 4806^2 .

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, 14239 + ... + 16102.

It is an arithmetic number, because the mean of its divisors is an integer number (4141683).

Almost surely, 2^28277812 is an apocalyptic number.

It is an amenable number.

28277812 is a deficient number, since it is larger than the sum of its proper divisors (21422384).

28277812 is a wasteful number, since it uses less digits than its factorization.

28277812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30578 (or 30576 counting only the distinct ones).

The product of its digits is 25088, while the sum is 37.

The square root of 28277812 is about 5317.6885956212. The cubic root of 28277812 is about 304.6598806452.

The spelling of 28277812 in words is "twenty-eight million, two hundred seventy-seven thousand, eight hundred twelve".