1687887155540 has 24 divisors (see below), whose sum is σ = 3547534210920. Its totient is φ = 674588922368.

The previous prime is 1687887155497. The next prime is 1687887155551. The reversal of 1687887155540 is 455517887861.

It can be written as a sum of positive squares in 4 ways, for example, as 341883445264 + 1346003710276 = 584708^2 + 1160174^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35346785 + ... + 35394504.

It is an arithmetic number, because the mean of its divisors is an integer number (147813925455).

Almost surely, 2^{1687887155540} is an apocalyptic number.

1687887155540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1687887155540 is an abundant number, since it is smaller than the sum of its proper divisors (1859647055380).

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

1687887155540 is a wasteful number, since it uses less digits than its factorization.

1687887155540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70742491 (or 70742489 counting only the distinct ones).

The product of its (nonzero) digits is 75264000, while the sum is 65.

The spelling of 1687887155540 in words is "one trillion, six hundred eighty-seven billion, eight hundred eighty-seven million, one hundred fifty-five thousand, five hundred forty".