1687998855 has 32 divisors (see below), whose sum is σ = 2896611840. Its totient is φ = 836784000.

The previous prime is 1687998847. The next prime is 1687998857. The reversal of 1687998855 is 5588997861.

It is a happy number.

It is not a de Polignac number, because 1687998855 - 2³ = 1687998847 is a prime.

It is a super-2 number, since 2×1687998855² = 5698680268962622050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687998857) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40771 + ... + 70980.

It is an arithmetic number, because the mean of its divisors is an integer number (90519120).

Almost surely, 2^1687998855 is an apocalyptic number.

1687998855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1687998855 is a deficient number, since it is larger than the sum of its proper divisors (1208612985).

1687998855 is a wasteful number, since it uses less digits than its factorization.

1687998855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111831.

The product of its digits is 43545600, while the sum is 66.

The square root of 1687998855 is about 41085.2632339139. The cubic root of 1687998855 is about 1190.6680934107.

The spelling of 1687998855 in words is "one billion, six hundred eighty-seven million, nine hundred ninety-eight thousand, eight hundred fifty-five".