816671844 has 72 divisors (see below), whose sum is σ = 2152037888. Its totient is φ = 260884800.

The previous prime is 816671827. The next prime is 816671861. The reversal of 816671844 is 448176618.

It is an interprime number because it is at equal distance from previous prime (816671827) and next prime (816671861).

It is a self number, because there is not a number n which added to its sum of digits gives 816671844.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84669 + ... + 93819.

Almost surely, 2^816671844 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 816671844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1076018944).

816671844 is an abundant number, since it is smaller than the sum of its proper divisors (1335366044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816671844 is a wasteful number, since it uses less digits than its factorization.

816671844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9265 (or 9260 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 816671844 is about 28577.4709167904. The cubic root of 816671844 is about 934.7221357780.

The spelling of 816671844 in words is "eight hundred sixteen million, six hundred seventy-one thousand, eight hundred forty-four".