28693287 has 24 divisors (see below), whose sum is σ = 49861760. Its totient is φ = 15532560.

The previous prime is 28693283. The next prime is 28693303. The reversal of 28693287 is 78239682.

28693287 is a `hidden beast` number, since 286 + 93 + 287 = 666.

It is not a de Polignac number, because 28693287 - 2² = 28693283 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28693283) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10789 + ... + 13182.

Almost surely, 2^28693287 is an apocalyptic number.

28693287 is a deficient number, since it is larger than the sum of its proper divisors (21168473).

28693287 is a wasteful number, since it uses less digits than its factorization.

28693287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24003 (or 24000 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28693287 is about 5356.6115222219. The cubic root of 28693287 is about 306.1447156067.

The spelling of 28693287 in words is "twenty-eight million, six hundred ninety-three thousand, two hundred eighty-seven".