641216826 has 24 divisors (see below), whose sum is σ = 1462425120. Its totient is φ = 202489416.

The previous prime is 641216801. The next prime is 641216837. The reversal of 641216826 is 628612146.

641216826 is a `hidden beast` number, since 641 + 2 + 1 + 6 + 8 + 2 + 6 = 666.

It is a super-2 number, since 2×641216826² = 822318035891028552, which contains 22 as substring.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 937110 + ... + 937793.

It is an arithmetic number, because the mean of its divisors is an integer number (60934380).

Almost surely, 2^641216826 is an apocalyptic number.

641216826 is an abundant number, since it is smaller than the sum of its proper divisors (821208294).

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

641216826 is a wasteful number, since it uses less digits than its factorization.

641216826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874930 (or 1874927 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 641216826 is about 25322.2594963404. The cubic root of 641216826 is about 862.3196911048.

The spelling of 641216826 in words is "six hundred forty-one million, two hundred sixteen thousand, eight hundred twenty-six".