28266687 has 12 divisors (see below), whose sum is σ = 40878760. Its totient is φ = 18821808.

The previous prime is 28266647. The next prime is 28266691. The reversal of 28266687 is 78666282.

It is a happy number.

It is not a de Polignac number, because 28266687 - 2⁷ = 28266559 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 (28266647) 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, 9864 + ... + 12402.

Almost surely, 2^28266687 is an apocalyptic number.

28266687 is a deficient number, since it is larger than the sum of its proper divisors (12612073).

28266687 is a wasteful number, since it uses less digits than its factorization.

28266687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3782 (or 3779 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 28266687 is about 5316.6424555353. The cubic root of 28266687 is about 304.6199225119.

The spelling of 28266687 in words is "twenty-eight million, two hundred sixty-six thousand, six hundred eighty-seven".