1328779261 has 8 divisors (see below), whose sum is σ = 1365154560. Its totient is φ = 1292428368.

The previous prime is 1328779237. The next prime is 1328779267. The reversal of 1328779261 is 1629778231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1328779261 - 2⁹ = 1328778749 is a prime.

It is a super-2 number, since 2×1328779261² = 3531308648927412242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328779267) 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, 182880 + ... + 190006.

It is an arithmetic number, because the mean of its divisors is an integer number (170644320).

Almost surely, 2^1328779261 is an apocalyptic number.

It is an amenable number.

1328779261 is a deficient number, since it is larger than the sum of its proper divisors (36375299).

1328779261 is an equidigital number, since it uses as much as digits as its factorization.

1328779261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12203.

The product of its digits is 254016, while the sum is 46.

The square root of 1328779261 is about 36452.4246244334. The cubic root of 1328779261 is about 1099.3878856121.

The spelling of 1328779261 in words is "one billion, three hundred twenty-eight million, seven hundred seventy-nine thousand, two hundred sixty-one".