1328779857 has 8 divisors (see below), whose sum is σ = 1875924576. Its totient is φ = 833744192.

The previous prime is 1328779847. The next prime is 1328779861. The reversal of 1328779857 is 7589778231.

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

It is not a de Polignac number, because 1328779857 - 2⁴ = 1328779841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1328779797 and 1328779806.

It is not an unprimeable number, because it can be changed into a prime (1328779807) 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, 13027203 + ... + 13027304.

It is an arithmetic number, because the mean of its divisors is an integer number (234490572).

Almost surely, 2^1328779857 is an apocalyptic number.

1328779857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1328779857 is a deficient number, since it is larger than the sum of its proper divisors (547144719).

1328779857 is a wasteful number, since it uses less digits than its factorization.

1328779857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26054527.

The product of its digits is 5927040, while the sum is 57.

The square root of 1328779857 is about 36452.4327994717. The cubic root of 1328779857 is about 1099.3880499823.

The spelling of 1328779857 in words is "one billion, three hundred twenty-eight million, seven hundred seventy-nine thousand, eight hundred fifty-seven".