28275277 has 4 divisors (see below), whose sum is σ = 28431676. Its totient is φ = 28118880.

The previous prime is 28275239. The next prime is 28275307. The reversal of 28275277 is 77257282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1865956 + 26409321 = 1366^2 + 5139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28275277 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 (28275227) 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, 77928 + ... + 78289.

It is an arithmetic number, because the mean of its divisors is an integer number (7107919).

Almost surely, 2^28275277 is an apocalyptic number.

It is an amenable number.

28275277 is a deficient number, since it is larger than the sum of its proper divisors (156399).

28275277 is a wasteful number, since it uses less digits than its factorization.

28275277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156398.

The product of its digits is 109760, while the sum is 40.

The square root of 28275277 is about 5317.4502348400. The cubic root of 28275277 is about 304.6507765005.

The spelling of 28275277 in words is "twenty-eight million, two hundred seventy-five thousand, two hundred seventy-seven".