816789885 has 16 divisors (see below), whose sum is σ = 1308026880. Its totient is φ = 435233600.

The previous prime is 816789881. The next prime is 816789899. The reversal of 816789885 is 588987618.

It is not a de Polignac number, because 816789885 - 2² = 816789881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816789881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6390 + ... + 40919.

It is an arithmetic number, because the mean of its divisors is an integer number (81751680).

Almost surely, 2^816789885 is an apocalyptic number.

It is an amenable number.

816789885 is a deficient number, since it is larger than the sum of its proper divisors (491236995).

816789885 is a wasteful number, since it uses less digits than its factorization.

816789885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48468.

The product of its digits is 7741440, while the sum is 60.

The square root of 816789885 is about 28579.5361228974. The cubic root of 816789885 is about 934.7671682354.

The spelling of 816789885 in words is "eight hundred sixteen million, seven hundred eighty-nine thousand, eight hundred eighty-five".