1687055540 has 24 divisors (see below), whose sum is σ = 3577217280. Its totient is φ = 668269728.

The previous prime is 1687055533. The next prime is 1687055549. The reversal of 1687055540 is 455507861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687055549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407420 + ... + 411539.

It is an arithmetic number, because the mean of its divisors is an integer number (149050720).

Almost surely, 2^1687055540 is an apocalyptic number.

1687055540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1687055540 is an abundant number, since it is smaller than the sum of its proper divisors (1890161740).

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

1687055540 is a wasteful number, since it uses less digits than its factorization.

1687055540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819071 (or 819069 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 41.

The square root of 1687055540 is about 41073.7816617852. The cubic root of 1687055540 is about 1190.4462559061.

The spelling of 1687055540 in words is "one billion, six hundred eighty-seven million, fifty-five thousand, five hundred forty".