1685674980 has 72 divisors (see below), whose sum is σ = 5578058304. Its totient is φ = 408648000.

The previous prime is 1685674957. The next prime is 1685674993. The reversal of 1685674980 is 894765861.

1685674980 is a `hidden beast` number, since 16 + 85 + 67 + 498 + 0 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 423696 + ... + 427655.

It is an arithmetic number, because the mean of its divisors is an integer number (77473032).

Almost surely, 2^1685674980 is an apocalyptic number.

1685674980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1685674980 is an abundant number, since it is smaller than the sum of its proper divisors (3892383324).

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

1685674980 is a wasteful number, since it uses less digits than its factorization.

1685674980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851377 (or 851372 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The square root of 1685674980 is about 41056.9723676747. The cubic root of 1685674980 is about 1190.1214432470.

The spelling of 1685674980 in words is "one billion, six hundred eighty-five million, six hundred seventy-four thousand, nine hundred eighty".