1680220408 has 16 divisors (see below), whose sum is σ = 3203811000. Its totient is φ = 825870816.

The previous prime is 1680220397. The next prime is 1680220433. The reversal of 1680220408 is 8040220861.

It is a self number, because there is not a number n which added to its sum of digits gives 1680220408.

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, 1779423 + ... + 1780366.

Almost surely, 2^1680220408 is an apocalyptic number.

It is an amenable number.

1680220408 is a deficient number, since it is larger than the sum of its proper divisors (1523590592).

1680220408 is a wasteful number, since it uses less digits than its factorization.

1680220408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3559854 (or 3559850 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 1680220408 is about 40990.4916779489. The cubic root of 1680220408 is about 1188.8363758963.

The spelling of 1680220408 in words is "one billion, six hundred eighty million, two hundred twenty thousand, four hundred eight".