868678529 has 4 divisors (see below), whose sum is σ = 919777284. Its totient is φ = 817579776.

The previous prime is 868678519. The next prime is 868678541. The reversal of 868678529 is 925876868.

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

It can be written as a sum of positive squares in 2 ways, for example, as 802418929 + 66259600 = 28327^2 + 8140^2 .

It is not a de Polignac number, because 868678529 - 2⁸ = 868678273 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (868678519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25549352 + ... + 25549385.

It is an arithmetic number, because the mean of its divisors is an integer number (229944321).

Almost surely, 2^868678529 is an apocalyptic number.

It is an amenable number.

868678529 is a deficient number, since it is larger than the sum of its proper divisors (51098755).

868678529 is a wasteful number, since it uses less digits than its factorization.

868678529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51098754.

The product of its digits is 11612160, while the sum is 59.

The square root of 868678529 is about 29473.3528632221. The cubic root of 868678529 is about 954.1566813962.

The spelling of 868678529 in words is "eight hundred sixty-eight million, six hundred seventy-eight thousand, five hundred twenty-nine".