1680320820 has 24 divisors (see below), whose sum is σ = 4704898464. Its totient is φ = 448085536.

The previous prime is 1680320797. The next prime is 1680320843. The reversal of 1680320820 is 280230861.

It is an interprime number because it is at equal distance from previous prime (1680320797) and next prime (1680320843).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14002614 + ... + 14002733.

It is an arithmetic number, because the mean of its divisors is an integer number (196037436).

Almost surely, 2^1680320820 is an apocalyptic number.

1680320820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1680320820 is an abundant number, since it is smaller than the sum of its proper divisors (3024577644).

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

1680320820 is a wasteful number, since it uses less digits than its factorization.

1680320820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28005359 (or 28005357 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 1680320820 is about 40991.7164802842. The cubic root of 1680320820 is about 1188.8600575236.

The spelling of 1680320820 in words is "one billion, six hundred eighty million, three hundred twenty thousand, eight hundred twenty".