1685131888 has 40 divisors (see below), whose sum is σ = 3749224320. Its totient is φ = 725653440.

The previous prime is 1685131849. The next prime is 1685131897. The reversal of 1685131888 is 8881315861.

It is a happy number.

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, 248620 + ... + 255307.

It is an arithmetic number, because the mean of its divisors is an integer number (93730608).

Almost surely, 2^1685131888 is an apocalyptic number.

It is an amenable number.

1685131888 is an abundant number, since it is smaller than the sum of its proper divisors (2064092432).

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

1685131888 is a wasteful number, since it uses less digits than its factorization.

1685131888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503965 (or 503959 counting only the distinct ones).

The product of its digits is 368640, while the sum is 49.

The square root of 1685131888 is about 41050.3579521543. The cubic root of 1685131888 is about 1189.9936181189.

The spelling of 1685131888 in words is "one billion, six hundred eighty-five million, one hundred thirty-one thousand, eight hundred eighty-eight".