1680781672 has 32 divisors (see below), whose sum is σ = 3308719680. Its totient is φ = 798906240.

The previous prime is 1680781657. The next prime is 1680781691. The reversal of 1680781672 is 2761870861.

It is a super-2 number, since 2×1680781672² = 5650054057862231168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

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, 1972 + ... + 58012.

It is an arithmetic number, because the mean of its divisors is an integer number (103397490).

Almost surely, 2^1680781672 is an apocalyptic number.

It is an amenable number.

1680781672 is a deficient number, since it is larger than the sum of its proper divisors (1627938008).

1680781672 is a wasteful number, since it uses less digits than its factorization.

1680781672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56233 (or 56229 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 1680781672 is about 40997.3373769566. The cubic root of 1680781672 is about 1188.9687348761.

The spelling of 1680781672 in words is "one billion, six hundred eighty million, seven hundred eighty-one thousand, six hundred seventy-two".