68306545 has 4 divisors (see below), whose sum is σ = 81967860. Its totient is φ = 54645232.

The previous prime is 68306543. The next prime is 68306549. The reversal of 68306545 is 54560386.

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 7091569 + 61214976 = 2663^2 + 7824^2 .

It is a cyclic number.

It is not a de Polignac number, because 68306545 - 2¹ = 68306543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68306543) 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, 6830650 + ... + 6830659.

It is an arithmetic number, because the mean of its divisors is an integer number (20491965).

Almost surely, 2^68306545 is an apocalyptic number.

It is an amenable number.

68306545 is a deficient number, since it is larger than the sum of its proper divisors (13661315).

68306545 is a wasteful number, since it uses less digits than its factorization.

68306545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13661314.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 68306545 is about 8264.7773714723. Note that the first 3 decimals coincide. The cubic root of 68306545 is about 408.7779295539. Note that the first 3 decimals are identical.

The spelling of 68306545 in words is "sixty-eight million, three hundred six thousand, five hundred forty-five".