1687397928 has 64 divisors (see below), whose sum is σ = 4286545920. Its totient is φ = 553425600.

The previous prime is 1687397897. The next prime is 1687397939. The reversal of 1687397928 is 8297937861.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1551801 + ... + 1552887.

It is an arithmetic number, because the mean of its divisors is an integer number (66977280).

Almost surely, 2^1687397928 is an apocalyptic number.

It is an amenable number.

1687397928 is an abundant number, since it is smaller than the sum of its proper divisors (2599147992).

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

1687397928 is a wasteful number, since it uses less digits than its factorization.

1687397928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2078 (or 2074 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 60.

The square root of 1687397928 is about 41077.9494132801. The cubic root of 1687397928 is about 1190.5267841662.

The spelling of 1687397928 in words is "one billion, six hundred eighty-seven million, three hundred ninety-seven thousand, nine hundred twenty-eight".