1685864256 has 28 divisors (see below), whose sum is σ = 4460516352. Its totient is φ = 561954688.

The previous prime is 1685864249. The next prime is 1685864261. The reversal of 1685864256 is 6524685861.

It is a junction number, because it is equal to n+sod(n) for n = 1685864199 and 1685864208.

It is a congruent number.

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, 4390080 + ... + 4390463.

Almost surely, 2^1685864256 is an apocalyptic number.

1685864256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1685864256 is an abundant number, since it is smaller than the sum of its proper divisors (2774652096).

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

1685864256 is an equidigital number, since it uses as much as digits as its factorization.

1685864256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8780558 (or 8780548 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 51.

The square root of 1685864256 is about 41059.2773438598. The cubic root of 1685864256 is about 1190.1659858384.

The spelling of 1685864256 in words is "one billion, six hundred eighty-five million, eight hundred sixty-four thousand, two hundred fifty-six".