816424287844 has 81 divisors (see below), whose sum is σ = 1596830095161. Its totient is φ = 364966763040.

The previous prime is 816424287727. The next prime is 816424287851. The reversal of 816424287844 is 448782424618.

The square root of 816424287844 is 903562.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2661528100 + 813762759744 = 51590^2 + 902088^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1331850082 + ... + 1331850694.

Almost surely, 2^816424287844 is an apocalyptic number.

816424287844 is the 903562-nd square number.

It is an amenable number.

816424287844 is a deficient number, since it is larger than the sum of its proper divisors (780405807317).

816424287844 is an equidigital number, since it uses as much as digits as its factorization.

816424287844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386 (or 693 counting only the distinct ones).

The product of its digits is 22020096, while the sum is 58.

The spelling of 816424287844 in words is "eight hundred sixteen billion, four hundred twenty-four million, two hundred eighty-seven thousand, eight hundred forty-four".