1680845172 has 24 divisors (see below), whose sum is σ = 4048488192. Its totient is φ = 542208000.

The previous prime is 1680845171. The next prime is 1680845237. The reversal of 1680845172 is 2715480861.

It is a super-3 number, since 3×1680845172³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680845171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2258829 + ... + 2259572.

It is an arithmetic number, because the mean of its divisors is an integer number (168687008).

Almost surely, 2^1680845172 is an apocalyptic number.

1680845172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1680845172 is an abundant number, since it is smaller than the sum of its proper divisors (2367643020).

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

1680845172 is a wasteful number, since it uses less digits than its factorization.

1680845172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4518439 (or 4518437 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 1680845172 is about 40998.1118101797. Note that the first 3 decimals coincide. The cubic root of 1680845172 is about 1188.9837077833.

The spelling of 1680845172 in words is "one billion, six hundred eighty million, eight hundred forty-five thousand, one hundred seventy-two".