1687910377 has 4 divisors (see below), whose sum is σ = 1688700160. Its totient is φ = 1687120596.

The previous prime is 1687910359. The next prime is 1687910387. The reversal of 1687910377 is 7730197861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1687910377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1687910377.

It is not an unprimeable number, because it can be changed into a prime (1687910387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391677 + ... + 395962.

It is an arithmetic number, because the mean of its divisors is an integer number (422175040).

Almost surely, 2^1687910377 is an apocalyptic number.

It is an amenable number.

1687910377 is a deficient number, since it is larger than the sum of its proper divisors (789783).

1687910377 is an equidigital number, since it uses as much as digits as its factorization.

1687910377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789782.

The product of its (nonzero) digits is 444528, while the sum is 49.

The square root of 1687910377 is about 41084.1864590258. The cubic root of 1687910377 is about 1190.6472897291.

The spelling of 1687910377 in words is "one billion, six hundred eighty-seven million, nine hundred ten thousand, three hundred seventy-seven".