813720016 has 10 divisors (see below), whose sum is σ = 1576582562. Its totient is φ = 406860000.

The previous prime is 813719999. The next prime is 813720029. The reversal of 813720016 is 610027318.

It can be written as a sum of positive squares in only one way, i.e., 518017600 + 295702416 = 22760^2 + 17196^2 .

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, 25428735 + ... + 25428766.

Almost surely, 2^813720016 is an apocalyptic number.

It is an amenable number.

813720016 is a deficient number, since it is larger than the sum of its proper divisors (762862546).

813720016 is a wasteful number, since it uses less digits than its factorization.

813720016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50857509 (or 50857503 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 813720016 is about 28525.7780963114. The cubic root of 813720016 is about 933.5946041791.

The spelling of 813720016 in words is "eight hundred thirteen million, seven hundred twenty thousand, sixteen".