7641881636 has 12 divisors (see below), whose sum is σ = 13425330828. Its totient is φ = 3806072832.

The previous prime is 7641881593. The next prime is 7641881651. The reversal of 7641881636 is 6361881467.

It can be written as a sum of positive squares in 2 ways, for example, as 6383051236 + 1258830400 = 79894^2 + 35480^2 .

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3715841 + ... + 3717896.

It is an arithmetic number, because the mean of its divisors is an integer number (1118777569).

Almost surely, 2^7641881636 is an apocalyptic number.

It is an amenable number.

7641881636 is a deficient number, since it is larger than the sum of its proper divisors (5783449192).

7641881636 is a wasteful number, since it uses less digits than its factorization.

7641881636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7433998 (or 7433996 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 50.

The square root of 7641881636 is about 87417.8565054074. The cubic root of 7641881636 is about 1969.7000785390.

The spelling of 7641881636 in words is "seven billion, six hundred forty-one million, eight hundred eighty-one thousand, six hundred thirty-six".