861332816 has 10 divisors (see below), whose sum is σ = 1668832362. Its totient is φ = 430666400.

The previous prime is 861332807. The next prime is 861332827. The reversal of 861332816 is 618233168.

861332816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 585640000 + 275692816 = 24200^2 + 16604^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 861332816.

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, 26916635 + ... + 26916666.

Almost surely, 2^861332816 is an apocalyptic number.

It is an amenable number.

861332816 is a deficient number, since it is larger than the sum of its proper divisors (807499546).

861332816 is a wasteful number, since it uses less digits than its factorization.

861332816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53833309 (or 53833303 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 861332816 is about 29348.4721237750. The cubic root of 861332816 is about 951.4595536637.

The spelling of 861332816 in words is "eight hundred sixty-one million, three hundred thirty-two thousand, eight hundred sixteen".