28770287 has 16 divisors (see below), whose sum is σ = 35542080. Its totient is φ = 22678272.

The previous prime is 28770283. The next prime is 28770289. The reversal of 28770287 is 78207782.

It is a cyclic number.

It is not a de Polignac number, because 28770287 - 2² = 28770283 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28770281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36833 + ... + 37605.

It is an arithmetic number, because the mean of its divisors is an integer number (2221380).

Almost surely, 2^28770287 is an apocalyptic number.

28770287 is a deficient number, since it is larger than the sum of its proper divisors (6771793).

28770287 is a wasteful number, since it uses less digits than its factorization.

28770287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202.

The product of its (nonzero) digits is 87808, while the sum is 41.

The square root of 28770287 is about 5363.7940862789. The cubic root of 28770287 is about 306.4183230174.

The spelling of 28770287 in words is "twenty-eight million, seven hundred seventy thousand, two hundred eighty-seven".