678879581 has 8 divisors (see below), whose sum is σ = 720717120. Its totient is φ = 637253568.

The previous prime is 678879563. The next prime is 678879587. The reversal of 678879581 is 185978876.

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

It is a de Polignac number, because none of the positive numbers 2^k-678879581 is a prime.

It is a super-2 number, since 2×678879581² = 921754970997471122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 678879581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678879587) 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, 46241 + ... + 59126.

It is an arithmetic number, because the mean of its divisors is an integer number (90089640).

Almost surely, 2^678879581 is an apocalyptic number.

It is an amenable number.

678879581 is a deficient number, since it is larger than the sum of its proper divisors (41837539).

678879581 is a wasteful number, since it uses less digits than its factorization.

678879581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105763.

The product of its digits is 6773760, while the sum is 59.

The square root of 678879581 is about 26055.3177105941. The cubic root of 678879581 is about 878.8826991742.

It can be divided in two parts, 6788795 and 81, that added together give a palindrome (6788876).

The spelling of 678879581 in words is "six hundred seventy-eight million, eight hundred seventy-nine thousand, five hundred eighty-one".