1685378574 has 48 divisors (see below), whose sum is σ = 4034085120. Its totient is φ = 504251280.

The previous prime is 1685378557. The next prime is 1685378599. The reversal of 1685378574 is 4758735861.

It is a happy number.

1685378574 is a `hidden beast` number, since 1 + 68 + 5 + 3 + 7 + 8 + 574 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1685378574.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38232 + ... + 69515.

It is an arithmetic number, because the mean of its divisors is an integer number (84043440).

Almost surely, 2^1685378574 is an apocalyptic number.

1685378574 is an abundant number, since it is smaller than the sum of its proper divisors (2348706546).

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

1685378574 is a wasteful number, since it uses less digits than its factorization.

1685378574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107845 (or 107842 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 54.

The square root of 1685378574 is about 41053.3625175819. The cubic root of 1685378574 is about 1190.0516829000.

The spelling of 1685378574 in words is "one billion, six hundred eighty-five million, three hundred seventy-eight thousand, five hundred seventy-four".