816822172 has 24 divisors (see below), whose sum is σ = 1474174800. Its totient is φ = 395763840.

The previous prime is 816822151. The next prime is 816822191. The reversal of 816822172 is 271228618.

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, 7723 + ... + 41149.

It is an arithmetic number, because the mean of its divisors is an integer number (61423950).

Almost surely, 2^816822172 is an apocalyptic number.

816822172 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

816822172 is a deficient number, since it is larger than the sum of its proper divisors (657352628).

816822172 is a wasteful number, since it uses less digits than its factorization.

816822172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33621 (or 33619 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 816822172 is about 28580.1009795277. The cubic root of 816822172 is about 934.7794849199.

The spelling of 816822172 in words is "eight hundred sixteen million, eight hundred twenty-two thousand, one hundred seventy-two".