868657729 has 3 divisors (see below), whose sum is σ = 868687203. Its totient is φ = 868628256.

The previous prime is 868657667. The next prime is 868657753. The reversal of 868657729 is 927756868.

The square root of 868657729 is 29473.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 205492225 + 663165504 = 14335^2 + 25752^2 .

It is not a de Polignac number, because 868657729 - 2⁹ = 868657217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (868657799) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 14737 + ... + 44209.

It is an arithmetic number, because the mean of its divisors is an integer number (289562401).

Almost surely, 2^868657729 is an apocalyptic number.

868657729 is the 29473-rd square number.

868657729 is the 14737-th centered octagonal number.

It is an amenable number.

868657729 is a deficient number, since it is larger than the sum of its proper divisors (29474).

868657729 is an frugal number, since it uses more digits than its factorization.

868657729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58946 (or 29473 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 58.

The cubic root of 868657729 is about 954.1490657606.

The spelling of 868657729 in words is "eight hundred sixty-eight million, six hundred fifty-seven thousand, seven hundred twenty-nine".