68508729 has 27 divisors (see below), whose sum is σ = 103413999. Its totient is φ = 43702560.

The previous prime is 68508709. The next prime is 68508731. The reversal of 68508729 is 92780586.

The square root of 68508729 is 8277.

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

It can be written as a sum of positive squares in only one way, i.e., 13155129 + 55353600 = 3627^2 + 7440^2 .

It is not a de Polignac number, because 68508729 - 2¹¹ = 68506681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68508709) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 769717 + ... + 769805.

Almost surely, 2^68508729 is an apocalyptic number.

68508729 is the 8277-th square number.

68508729 is the 4139-th centered octagonal number.

It is an amenable number.

68508729 is a deficient number, since it is larger than the sum of its proper divisors (34905270).

68508729 is an equidigital number, since it uses as much as digits as its factorization.

68508729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The cubic root of 68508729 is about 409.1808530986.

The spelling of 68508729 in words is "sixty-eight million, five hundred eight thousand, seven hundred twenty-nine".