863721616 has 20 divisors (see below), whose sum is σ = 1731167100. Its totient is φ = 416968832.

The previous prime is 863721613. The next prime is 863721623. The reversal of 863721616 is 616127368.

It is a happy number.

863721616 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 2 ways, for example, as 306950400 + 556771216 = 17520^2 + 23596^2 .

It is not an unprimeable number, because it can be changed into a prime (863721611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 930271 + ... + 931198.

It is an arithmetic number, because the mean of its divisors is an integer number (86558355).

Almost surely, 2^863721616 is an apocalyptic number.

It is an amenable number.

863721616 is an abundant number, since it is smaller than the sum of its proper divisors (867445484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

863721616 is a wasteful number, since it uses less digits than its factorization.

863721616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1861506 (or 1861500 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 863721616 is about 29389.1411238913. The cubic root of 863721616 is about 952.3383268929.

The spelling of 863721616 in words is "eight hundred sixty-three million, seven hundred twenty-one thousand, six hundred sixteen".