1680620856 has 64 divisors (see below), whose sum is σ = 4525701120. Its totient is φ = 518559360.

The previous prime is 1680620827. The next prime is 1680620857. The reversal of 1680620856 is 6580260861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680620857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31995 + ... + 66218.

It is an arithmetic number, because the mean of its divisors is an integer number (70714080).

Almost surely, 2^1680620856 is an apocalyptic number.

It is an amenable number.

1680620856 is an abundant number, since it is smaller than the sum of its proper divisors (2845080264).

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

1680620856 is a wasteful number, since it uses less digits than its factorization.

1680620856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98276 (or 98272 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 1680620856 is about 40995.3760319380. The cubic root of 1680620856 is about 1188.9308137711.

The spelling of 1680620856 in words is "one billion, six hundred eighty million, six hundred twenty thousand, eight hundred fifty-six".