1680804678 has 64 divisors (see below), whose sum is σ = 3984744960. Its totient is φ = 462454272.

The previous prime is 1680804677. The next prime is 1680804701. The reversal of 1680804678 is 8764080861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680804677) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 525801 + ... + 528987.

It is an arithmetic number, because the mean of its divisors is an integer number (62261640).

Almost surely, 2^1680804678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1680804678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1992372480).

1680804678 is an abundant number, since it is smaller than the sum of its proper divisors (2303940282).

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

1680804678 is a wasteful number, since it uses less digits than its factorization.

1680804678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661.

The product of its (nonzero) digits is 516096, while the sum is 48.

The square root of 1680804678 is about 40997.6179551934. The cubic root of 1680804678 is about 1188.9741595921.

The spelling of 1680804678 in words is "one billion, six hundred eighty million, eight hundred four thousand, six hundred seventy-eight".