28279277 has 12 divisors (see below), whose sum is σ = 32237280. Its totient is φ = 24727248.

The previous prime is 28279261. The next prime is 28279291. The reversal of 28279277 is 77297282.

It is not a de Polignac number, because 28279277 - 2⁴ = 28279261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28279247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1193 + ... + 7614.

It is an arithmetic number, because the mean of its divisors is an integer number (2686440).

Almost surely, 2^28279277 is an apocalyptic number.

It is an amenable number.

28279277 is a deficient number, since it is larger than the sum of its proper divisors (3958003).

28279277 is a wasteful number, since it uses less digits than its factorization.

28279277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8852 (or 8839 counting only the distinct ones).

The product of its digits is 197568, while the sum is 44.

The square root of 28279277 is about 5317.8263416550. The cubic root of 28279277 is about 304.6651417668.

The spelling of 28279277 in words is "twenty-eight million, two hundred seventy-nine thousand, two hundred seventy-seven".