816889822 has 32 divisors (see below), whose sum is σ = 1443504384. Its totient is φ = 339422400.

The previous prime is 816889817. The next prime is 816889823. The reversal of 816889822 is 228988618.

It is a self number, because there is not a number n which added to its sum of digits gives 816889822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816889823) 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, 89197 + ... + 97927.

It is an arithmetic number, because the mean of its divisors is an integer number (45109512).

Almost surely, 2^816889822 is an apocalyptic number.

816889822 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

816889822 is a deficient number, since it is larger than the sum of its proper divisors (626614562).

816889822 is a wasteful number, since it uses less digits than its factorization.

816889822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8944.

The product of its digits is 884736, while the sum is 52.

The square root of 816889822 is about 28581.2844707861. The cubic root of 816889822 is about 934.8052906536.

The spelling of 816889822 in words is "eight hundred sixteen million, eight hundred eighty-nine thousand, eight hundred twenty-two".