816788749 has 8 divisors (see below), whose sum is σ = 988383168. Its totient is φ = 658921920.

The previous prime is 816788729. The next prime is 816788761. The reversal of 816788749 is 947887618.

816788749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 816788749 - 2⁹ = 816788237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 816788693 and 816788702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816788729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3431767 + ... + 3432004.

It is an arithmetic number, because the mean of its divisors is an integer number (123547896).

Almost surely, 2^816788749 is an apocalyptic number.

It is an amenable number.

816788749 is a deficient number, since it is larger than the sum of its proper divisors (171594419).

816788749 is a wasteful number, since it uses less digits than its factorization.

816788749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6863795.

The product of its digits is 5419008, while the sum is 58.

The square root of 816788749 is about 28579.5162485302. The cubic root of 816788749 is about 934.7667348739.

The spelling of 816788749 in words is "eight hundred sixteen million, seven hundred eighty-eight thousand, seven hundred forty-nine".