816591672 has 128 divisors (see below), whose sum is σ = 2499974400. Its totient is φ = 245379456.

The previous prime is 816591653. The next prime is 816591673. The reversal of 816591672 is 276195618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816591673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117363 + ... + 124125.

It is an arithmetic number, because the mean of its divisors is an integer number (19531050).

Almost surely, 2^816591672 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 816591672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1249987200).

816591672 is an abundant number, since it is smaller than the sum of its proper divisors (1683382728).

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

816591672 is a wasteful number, since it uses less digits than its factorization.

816591672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6834 (or 6824 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 816591672 is about 28576.0681690116. The cubic root of 816591672 is about 934.6915478105.

It can be divided in two parts, 8 and 16591672, that added together give a triangular number (16591680 = T₅₇₆₀).

The spelling of 816591672 in words is "eight hundred sixteen million, five hundred ninety-one thousand, six hundred seventy-two".