1678648867 has 16 divisors (see below), whose sum is σ = 2044267200. Its totient is φ = 1345563648.

The previous prime is 1678648837. The next prime is 1678648871. The reversal of 1678648867 is 7688468761.

It is a cyclic number.

It is not a de Polignac number, because 1678648867 - 2⁷ = 1678648739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1678648837) 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, 26242 + ... + 63607.

It is an arithmetic number, because the mean of its divisors is an integer number (127766700).

Almost surely, 2^1678648867 is an apocalyptic number.

1678648867 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1678648867 is a deficient number, since it is larger than the sum of its proper divisors (365618333).

1678648867 is a wasteful number, since it uses less digits than its factorization.

1678648867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90030.

The product of its digits is 21676032, while the sum is 61.

The square root of 1678648867 is about 40971.3176136672. The cubic root of 1678648867 is about 1188.4656134480.

The spelling of 1678648867 in words is "one billion, six hundred seventy-eight million, six hundred forty-eight thousand, eight hundred sixty-seven".