28942287 has 16 divisors (see below), whose sum is σ = 42188160. Its totient is φ = 17503200.

The previous prime is 28942283. The next prime is 28942327. The reversal of 28942287 is 78224982.

It is not a de Polignac number, because 28942287 - 2² = 28942283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28942283) 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, 27837 + ... + 28857.

It is an arithmetic number, because the mean of its divisors is an integer number (2636760).

Almost surely, 2^28942287 is an apocalyptic number.

28942287 is a deficient number, since it is larger than the sum of its proper divisors (13245873).

28942287 is a wasteful number, since it uses less digits than its factorization.

28942287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1894.

The product of its digits is 129024, while the sum is 42.

The square root of 28942287 is about 5379.8036209512. The cubic root of 28942287 is about 307.0277396092.

The spelling of 28942287 in words is "twenty-eight million, nine hundred forty-two thousand, two hundred eighty-seven".