1687671408 has 20 divisors (see below), whose sum is σ = 4359817928. Its totient is φ = 562557120.

The previous prime is 1687671389. The next prime is 1687671431. The reversal of 1687671408 is 8041767861.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 35159821 = 1687671408 / (1 + 6 + 8 + 7 + 6 + 7 + 1 + 4 + 0 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17579863 + ... + 17579958.

Almost surely, 2^1687671408 is an apocalyptic number.

It is an amenable number.

1687671408 is an abundant number, since it is smaller than the sum of its proper divisors (2672146520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1687671408 is a wasteful number, since it uses less digits than its factorization.

1687671408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35159832 (or 35159826 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 48.

The square root of 1687671408 is about 41081.2780716472. The cubic root of 1687671408 is about 1190.5910977209.

The spelling of 1687671408 in words is "one billion, six hundred eighty-seven million, six hundred seventy-one thousand, four hundred eight".