1687232128 has 16 divisors (see below), whose sum is σ = 3361283010. Its totient is φ = 843616000.

The previous prime is 1687232119. The next prime is 1687232147. The reversal of 1687232128 is 8212327861.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1670520384 + 16711744 = 40872^2 + 4088^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6590623 + ... + 6590878.

Almost surely, 2^1687232128 is an apocalyptic number.

It is an amenable number.

1687232128 is a deficient number, since it is larger than the sum of its proper divisors (1674050882).

1687232128 is an equidigital number, since it uses as much as digits as its factorization.

1687232128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13181515 (or 13181503 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 1687232128 is about 41075.9312493338. The cubic root of 1687232128 is about 1190.4877900434.

Adding to 1687232128 its reverse (8212327861), we get a palindrome (9899559989).

The spelling of 1687232128 in words is "one billion, six hundred eighty-seven million, two hundred thirty-two thousand, one hundred twenty-eight".