1329690644 has 6 divisors (see below), whose sum is σ = 2326958634. Its totient is φ = 664845320.

The previous prime is 1329690641. The next prime is 1329690667. The reversal of 1329690644 is 4460969231.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1133130244 + 196560400 = 33662^2 + 14020^2 .

It is a super-2 number, since 2×1329690644² = 3536154417482269472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1329690595 and 1329690604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1329690641) 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 as a sum of consecutive naturals, namely, 166211327 + ... + 166211334.

It is an arithmetic number, because the mean of its divisors is an integer number (387826439).

Almost surely, 2^1329690644 is an apocalyptic number.

It is an amenable number.

1329690644 is a deficient number, since it is larger than the sum of its proper divisors (997267990).

1329690644 is a wasteful number, since it uses less digits than its factorization.

1329690644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332422665 (or 332422663 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 1329690644 is about 36464.9234744844. The cubic root of 1329690644 is about 1099.6391775236.

The spelling of 1329690644 in words is "one billion, three hundred twenty-nine million, six hundred ninety thousand, six hundred forty-four".