1687643265 has 48 divisors (see below), whose sum is σ = 3392049024. Its totient is φ = 701352960.

The previous prime is 1687643219. The next prime is 1687643299. The reversal of 1687643265 is 5623467861.

It is not a de Polignac number, because 1687643265 - 2⁶ = 1687643201 is a prime.

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 47 ways as a sum of consecutive naturals, for example, 53712 + ... + 79121.

It is an arithmetic number, because the mean of its divisors is an integer number (70667688).

Almost surely, 2^1687643265 is an apocalyptic number.

1687643265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1687643265 is an abundant number, since it is smaller than the sum of its proper divisors (1704405759).

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

1687643265 is a wasteful number, since it uses less digits than its factorization.

1687643265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132870 (or 132859 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 48.

The square root of 1687643265 is about 41080.9355419275. The cubic root of 1687643265 is about 1190.5844797282.

The spelling of 1687643265 in words is "one billion, six hundred eighty-seven million, six hundred forty-three thousand, two hundred sixty-five".