1999328677 has 2 divisors, whose sum is σ = 1999328678. Its totient is φ = 1999328676.

The previous prime is 1999328671. The next prime is 1999328687. The reversal of 1999328677 is 7768239991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1827220516 + 172108161 = 42746^2 + 13119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999328677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999328671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999664338 + 999664339.

It is an arithmetic number, because the mean of its divisors is an integer number (999664339).

Almost surely, 2^1999328677 is an apocalyptic number.

It is an amenable number.

1999328677 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999328677 is an equidigital number, since it uses as much as digits as its factorization.

1999328677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10287648, while the sum is 61.

The square root of 1999328677 is about 44713.8533007389. The cubic root of 1999328677 is about 1259.7800651228.

The spelling of 1999328677 in words is "one billion, nine hundred ninety-nine million, three hundred twenty-eight thousand, six hundred seventy-seven".