1687648580 has 12 divisors (see below), whose sum is σ = 3544062060. Its totient is φ = 675059424.

The previous prime is 1687648579. The next prime is 1687648603. The reversal of 1687648580 is 858467861.

It can be written as a sum of positive squares in 2 ways, for example, as 285745216 + 1401903364 = 16904^2 + 37442^2 .

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, 42191195 + ... + 42191234.

It is an arithmetic number, because the mean of its divisors is an integer number (295338505).

Almost surely, 2^1687648580 is an apocalyptic number.

1687648580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1687648580 is an abundant number, since it is smaller than the sum of its proper divisors (1856413480).

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

1687648580 is a wasteful number, since it uses less digits than its factorization.

1687648580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84382438 (or 84382436 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 53.

The square root of 1687648580 is about 41081.0002312505. Note that the first 3 decimals coincide. The cubic root of 1687648580 is about 1190.5857295875.

It can be divided in two parts, 16876 and 48580, that added together give a palindrome (65456).

The spelling of 1687648580 in words is "one billion, six hundred eighty-seven million, six hundred forty-eight thousand, five hundred eighty".