68072257 has 8 divisors (see below), whose sum is σ = 74345760. Its totient is φ = 61812960.

The previous prime is 68072243. The next prime is 68072287. The reversal of 68072257 is 75227086.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-68072257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68072237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8173 + ... + 14245.

It is an arithmetic number, because the mean of its divisors is an integer number (9293220).

Almost surely, 2^68072257 is an apocalyptic number.

It is an amenable number.

68072257 is a deficient number, since it is larger than the sum of its proper divisors (6273503).

68072257 is a wasteful number, since it uses less digits than its factorization.

68072257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7103.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 68072257 is about 8250.5913121424. The cubic root of 68072257 is about 408.3100316381.

The spelling of 68072257 in words is "sixty-eight million, seventy-two thousand, two hundred fifty-seven".