28643277 has 8 divisors (see below), whose sum is σ = 41128864. Its totient is φ = 17626608.

The previous prime is 28643273. The next prime is 28643299. The reversal of 28643277 is 77234682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28643277 - 2² = 28643273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 734443 = 28643277 / (2 + 8 + 6 + 4 + 3 + 2 + 7 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28643273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 367183 + ... + 367260.

It is an arithmetic number, because the mean of its divisors is an integer number (5141108).

Almost surely, 2^28643277 is an apocalyptic number.

It is an amenable number.

28643277 is a deficient number, since it is larger than the sum of its proper divisors (12485587).

28643277 is a wasteful number, since it uses less digits than its factorization.

28643277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734459.

The product of its digits is 112896, while the sum is 39.

The square root of 28643277 is about 5351.9414234463. The cubic root of 28643277 is about 305.9667506271.

It can be divided in two parts, 28643 and 277, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 28643277 in words is "twenty-eight million, six hundred forty-three thousand, two hundred seventy-seven".