1687785042 has 16 divisors (see below), whose sum is σ = 3402150912. Its totient is φ = 558164880.

The previous prime is 1687785023. The next prime is 1687785101. The reversal of 1687785042 is 2405877861.

It is a junction number, because it is equal to n+sod(n) for n = 1687784982 and 1687785000.

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, 1106709 + ... + 1108232.

It is an arithmetic number, because the mean of its divisors is an integer number (212634432).

Almost surely, 2^1687785042 is an apocalyptic number.

1687785042 is an abundant number, since it is smaller than the sum of its proper divisors (1714365870).

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

1687785042 is a wasteful number, since it uses less digits than its factorization.

1687785042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215073.

The product of its (nonzero) digits is 752640, while the sum is 48.

The square root of 1687785042 is about 41082.6610871302. The cubic root of 1687785042 is about 1190.6178186793.

The spelling of 1687785042 in words is "one billion, six hundred eighty-seven million, seven hundred eighty-five thousand, forty-two".