865872782 has 4 divisors (see below), whose sum is σ = 1298809176. Its totient is φ = 432936390.

The previous prime is 865872773. The next prime is 865872803. The reversal of 865872782 is 287278568.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216468194 + ... + 216468197.

It is an arithmetic number, because the mean of its divisors is an integer number (324702294).

Almost surely, 2^865872782 is an apocalyptic number.

865872782 is a deficient number, since it is larger than the sum of its proper divisors (432936394).

865872782 is a wasteful number, since it uses less digits than its factorization.

865872782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432936393.

The product of its digits is 3010560, while the sum is 53.

The square root of 865872782 is about 29425.7163379246. The cubic root of 865872782 is about 953.1282957041.

The spelling of 865872782 in words is "eight hundred sixty-five million, eight hundred seventy-two thousand, seven hundred eighty-two".