646327836 has 180 divisors, whose sum is σ = 2144746296. Its totient is φ = 167832000.

The previous prime is 646327823. The next prime is 646327837. The reversal of 646327836 is 638723646.

646327836 is a `hidden beast` number, since 6 + 4 + 632 + 7 + 8 + 3 + 6 = 666.

It is a super-3 number, since 3×646327836³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 646327791 and 646327800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646327837) 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 59 ways as a sum of consecutive naturals, for example, 172786 + ... + 176486.

Almost surely, 2^646327836 is an apocalyptic number.

646327836 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646327836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1072373148).

646327836 is an abundant number, since it is smaller than the sum of its proper divisors (1498418460).

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

646327836 is a wasteful number, since it uses less digits than its factorization.

646327836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3742 (or 3724 counting only the distinct ones).

The product of its digits is 870912, while the sum is 45.

The square root of 646327836 is about 25422.9785037080. The cubic root of 646327836 is about 864.6047560010.

The spelling of 646327836 in words is "six hundred forty-six million, three hundred twenty-seven thousand, eight hundred thirty-six".