68722591 has 4 divisors (see below), whose sum is σ = 78540112. Its totient is φ = 58905072.

The previous prime is 68722553. The next prime is 68722607. The reversal of 68722591 is 19522786.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68722591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68722531) 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, 4908750 + ... + 4908763.

It is an arithmetic number, because the mean of its divisors is an integer number (19635028).

Almost surely, 2^68722591 is an apocalyptic number.

68722591 is a deficient number, since it is larger than the sum of its proper divisors (9817521).

68722591 is an equidigital number, since it uses as much as digits as its factorization.

68722591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9817520.

The product of its digits is 60480, while the sum is 40.

The square root of 68722591 is about 8289.9089862314. The cubic root of 68722591 is about 409.6061873932.

The spelling of 68722591 in words is "sixty-eight million, seven hundred twenty-two thousand, five hundred ninety-one".