1329778746 has 12 divisors (see below), whose sum is σ = 2881187322. Its totient is φ = 443259576.

The previous prime is 1329778733. The next prime is 1329778763. The reversal of 1329778746 is 6478779231.

It can be written as a sum of positive squares in only one way, i.e., 1298809521 + 30969225 = 36039^2 + 5565^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1329778692 and 1329778701.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36938281 + ... + 36938316.

Almost surely, 2^1329778746 is an apocalyptic number.

1329778746 is an abundant number, since it is smaller than the sum of its proper divisors (1551408576).

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

1329778746 is a wasteful number, since it uses less digits than its factorization.

1329778746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73876605 (or 73876602 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 54.

The square root of 1329778746 is about 36466.1314921120. The cubic root of 1329778746 is about 1099.6634634409.

The spelling of 1329778746 in words is "one billion, three hundred twenty-nine million, seven hundred seventy-eight thousand, seven hundred forty-six".