1687144251228 has 48 divisors (see below), whose sum is σ = 4172018296320. Its totient is φ = 528820213504.

The previous prime is 1687144251203. The next prime is 1687144251241. The reversal of 1687144251228 is 8221524417861.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3523998 + ... + 3974021.

It is an arithmetic number, because the mean of its divisors is an integer number (86917047840).

Almost surely, 2^{1687144251228} is an apocalyptic number.

It is an amenable number.

1687144251228 is an abundant number, since it is smaller than the sum of its proper divisors (2484874045092).

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

1687144251228 is a wasteful number, since it uses less digits than its factorization.

1687144251228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7499146 (or 7499144 counting only the distinct ones).

The product of its digits is 1720320, while the sum is 51.

The spelling of 1687144251228 in words is "one trillion, six hundred eighty-seven billion, one hundred forty-four million, two hundred fifty-one thousand, two hundred twenty-eight".