816729005 has 8 divisors (see below), whose sum is σ = 981461400. Its totient is φ = 652458816.

The previous prime is 816728987. The next prime is 816729071. The reversal of 816729005 is 500927618.

It can be written as a sum of positive squares in 4 ways, for example, as 19061956 + 797667049 = 4366^2 + 28243^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 816729005 - 2¹⁴ = 816712621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 816729005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111650 + ... + 118739.

It is an arithmetic number, because the mean of its divisors is an integer number (122682675).

Almost surely, 2^816729005 is an apocalyptic number.

It is an amenable number.

816729005 is a deficient number, since it is larger than the sum of its proper divisors (164732395).

816729005 is a wasteful number, since it uses less digits than its factorization.

816729005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231103.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 816729005 is about 28578.4710052865. The cubic root of 816729005 is about 934.7439431522.

The spelling of 816729005 in words is "eight hundred sixteen million, seven hundred twenty-nine thousand, five".