1680238668 has 18 divisors (see below), whose sum is σ = 3920888244. Its totient is φ = 560032224.

The previous prime is 1680238661. The next prime is 1680238687. The reversal of 1680238668 is 8668320861.

It is not an unprimeable number, because it can be changed into a prime (1680238661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 136080 + ... + 147912.

Almost surely, 2^1680238668 is an apocalyptic number.

It is an amenable number.

1680238668 is an abundant number, since it is smaller than the sum of its proper divisors (2240649576).

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

1680238668 is an frugal number, since it uses more digits than its factorization.

1680238668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23673 (or 11838 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The square root of 1680238668 is about 40990.7144119251. The cubic root of 1680238668 is about 1188.8406824888.

Multiplying 1680238668 by its sum of digits (48), we get a square (80651456064 = 283992²).

The spelling of 1680238668 in words is "one billion, six hundred eighty million, two hundred thirty-eight thousand, six hundred sixty-eight".