68722509 has 4 divisors (see below), whose sum is σ = 91630016. Its totient is φ = 45815004.

The previous prime is 68722499. The next prime is 68722523. The reversal of 68722509 is 90522786.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 68722509 - 2⁸ = 68722253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68722909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11453749 + ... + 11453754.

It is an arithmetic number, because the mean of its divisors is an integer number (22907504).

Almost surely, 2^68722509 is an apocalyptic number.

It is an amenable number.

68722509 is a deficient number, since it is larger than the sum of its proper divisors (22907507).

68722509 is a wasteful number, since it uses less digits than its factorization.

68722509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22907506.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 68722509 is about 8289.9040404579. The cubic root of 68722509 is about 409.6060244787.

The spelling of 68722509 in words is "sixty-eight million, seven hundred twenty-two thousand, five hundred nine".