1685920688 has 20 divisors (see below), whose sum is σ = 3354755520. Its totient is φ = 820177344.

The previous prime is 1685920609. The next prime is 1685920729. The reversal of 1685920688 is 8860295861.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1423328 + ... + 1424511.

It is an arithmetic number, because the mean of its divisors is an integer number (167737776).

Almost surely, 2^1685920688 is an apocalyptic number.

It is an amenable number.

1685920688 is a deficient number, since it is larger than the sum of its proper divisors (1668834832).

1685920688 is a wasteful number, since it uses less digits than its factorization.

1685920688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847884 (or 2847878 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 53.

The square root of 1685920688 is about 41059.9645396827. The cubic root of 1685920688 is about 1190.1792654164.

The spelling of 1685920688 in words is "one billion, six hundred eighty-five million, nine hundred twenty thousand, six hundred eighty-eight".