865391228 has 12 divisors (see below), whose sum is σ = 1630929720. Its totient is φ = 399411312.

The previous prime is 865391209. The next prime is 865391231. The reversal of 865391228 is 822193568.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8321018 + ... + 8321121.

It is an arithmetic number, because the mean of its divisors is an integer number (135910810).

Almost surely, 2^865391228 is an apocalyptic number.

It is an amenable number.

865391228 is a deficient number, since it is larger than the sum of its proper divisors (765538492).

865391228 is a wasteful number, since it uses less digits than its factorization.

865391228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16642156 (or 16642154 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 865391228 is about 29417.5326633625. The cubic root of 865391228 is about 952.9515692586.

The spelling of 865391228 in words is "eight hundred sixty-five million, three hundred ninety-one thousand, two hundred twenty-eight".