1687441768 has 8 divisors (see below), whose sum is σ = 3163953330. Its totient is φ = 843720880.

The previous prime is 1687441757. The next prime is 1687441781. The reversal of 1687441768 is 8671447861.

It can be written as a sum of positive squares in only one way, i.e., 1664803204 + 22638564 = 40802^2 + 4758^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105465103 + ... + 105465118.

Almost surely, 2^1687441768 is an apocalyptic number.

It is an amenable number.

1687441768 is a deficient number, since it is larger than the sum of its proper divisors (1476511562).

1687441768 is a wasteful number, since it uses less digits than its factorization.

1687441768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210930227 (or 210930223 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 52.

The square root of 1687441768 is about 41078.4830294401. The cubic root of 1687441768 is about 1190.5370943685.

The spelling of 1687441768 in words is "one billion, six hundred eighty-seven million, four hundred forty-one thousand, seven hundred sixty-eight".