681679873 has 8 divisors (see below), whose sum is σ = 782979200. Its totient is φ = 581359680.

The previous prime is 681679841. The next prime is 681679879. The reversal of 681679873 is 378976186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681679873 - 2⁵ = 681679841 is a prime.

It is a super-2 number, since 2×681679873² = 929374898506592258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681679879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243288 + ... + 246073.

It is an arithmetic number, because the mean of its divisors is an integer number (97872400).

Almost surely, 2^681679873 is an apocalyptic number.

It is an amenable number.

681679873 is a deficient number, since it is larger than the sum of its proper divisors (101299327).

681679873 is a wasteful number, since it uses less digits than its factorization.

681679873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489567.

The product of its digits is 3048192, while the sum is 55.

The square root of 681679873 is about 26108.9998467961. Note that the first 3 decimals coincide. The cubic root of 681679873 is about 880.0894679181.

The spelling of 681679873 in words is "six hundred eighty-one million, six hundred seventy-nine thousand, eight hundred seventy-three".