1328662642 has 16 divisors (see below), whose sum is σ = 2111256792. Its totient is φ = 624948480.

The previous prime is 1328662631. The next prime is 1328662649. The reversal of 1328662642 is 2462668231.

It can be written as a sum of positive squares in 4 ways, for example, as 1104831121 + 223831521 = 33239^2 + 14961^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1328662595 and 1328662604.

It is not an unprimeable number, because it can be changed into a prime (1328662649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71248 + ... + 87940.

Almost surely, 2^1328662642 is an apocalyptic number.

1328662642 is a deficient number, since it is larger than the sum of its proper divisors (782594150).

1328662642 is a wasteful number, since it uses less digits than its factorization.

1328662642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19053.

The product of its digits is 165888, while the sum is 40.

The square root of 1328662642 is about 36450.8249838052. The cubic root of 1328662642 is about 1099.3557224404.

The spelling of 1328662642 in words is "one billion, three hundred twenty-eight million, six hundred sixty-two thousand, six hundred forty-two".