1678672811 has 4 divisors (see below), whose sum is σ = 1688724912. Its totient is φ = 1668620712.

The previous prime is 1678672777. The next prime is 1678672841. The reversal of 1678672811 is 1182768761.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1678672811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1678672841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5025800 + ... + 5026133.

It is an arithmetic number, because the mean of its divisors is an integer number (422181228).

Almost surely, 2^1678672811 is an apocalyptic number.

1678672811 is a deficient number, since it is larger than the sum of its proper divisors (10052101).

1678672811 is a wasteful number, since it uses less digits than its factorization.

1678672811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10052100.

The product of its digits is 225792, while the sum is 47.

The square root of 1678672811 is about 40971.6098170428. The cubic root of 1678672811 is about 1188.4712641206.

The spelling of 1678672811 in words is "one billion, six hundred seventy-eight million, six hundred seventy-two thousand, eight hundred eleven".