68972689 has 4 divisors (see below), whose sum is σ = 73029924. Its totient is φ = 64915456.

The previous prime is 68972677. The next prime is 68972707. The reversal of 68972689 is 98627986.

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 20322064 + 48650625 = 4508^2 + 6975^2 .

It is a cyclic number.

It is not a de Polignac number, because 68972689 - 2⁹ = 68972177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68972089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2028592 + ... + 2028625.

It is an arithmetic number, because the mean of its divisors is an integer number (18257481).

Almost surely, 2^68972689 is an apocalyptic number.

It is an amenable number.

68972689 is a deficient number, since it is larger than the sum of its proper divisors (4057235).

68972689 is a wasteful number, since it uses less digits than its factorization.

68972689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4057234.

The product of its digits is 2612736, while the sum is 55.

The square root of 68972689 is about 8304.9797711975. The cubic root of 68972689 is about 410.1024709172.

The spelling of 68972689 in words is "sixty-eight million, nine hundred seventy-two thousand, six hundred eighty-nine".