1680868215 has 24 divisors (see below), whose sum is σ = 3137621760. Its totient is φ = 827504064.

The previous prime is 1680868213. The next prime is 1680868253. The reversal of 1680868215 is 5128680861.

It is not a de Polignac number, because 1680868215 - 2¹ = 1680868213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680868213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1436055 + ... + 1437224.

It is an arithmetic number, because the mean of its divisors is an integer number (130734240).

Almost surely, 2^1680868215 is an apocalyptic number.

1680868215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1680868215 is a deficient number, since it is larger than the sum of its proper divisors (1456753545).

1680868215 is a wasteful number, since it uses less digits than its factorization.

1680868215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2873303 (or 2873300 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The square root of 1680868215 is about 40998.3928343539. The cubic root of 1680868215 is about 1188.9891410869.

The spelling of 1680868215 in words is "one billion, six hundred eighty million, eight hundred sixty-eight thousand, two hundred fifteen".