68457309 has 4 divisors (see below), whose sum is σ = 91276416. Its totient is φ = 45638204.

The previous prime is 68457307. The next prime is 68457343. The reversal of 68457309 is 90375486.

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 a cyclic number.

It is not a de Polignac number, because 68457309 - 2¹ = 68457307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68457307) 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, 11409549 + ... + 11409554.

It is an arithmetic number, because the mean of its divisors is an integer number (22819104).

Almost surely, 2^68457309 is an apocalyptic number.

It is an amenable number.

68457309 is a deficient number, since it is larger than the sum of its proper divisors (22819107).

68457309 is a wasteful number, since it uses less digits than its factorization.

68457309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22819106.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 68457309 is about 8273.8932190354. The cubic root of 68457309 is about 409.0784557062.

The spelling of 68457309 in words is "sixty-eight million, four hundred fifty-seven thousand, three hundred nine".