68408545 has 4 divisors (see below), whose sum is σ = 82090260. Its totient is φ = 54726832.

The previous prime is 68408513. The next prime is 68408551. The reversal of 68408545 is 54580486.

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 20757136 + 47651409 = 4556^2 + 6903^2 .

It is a cyclic number.

It is not a de Polignac number, because 68408545 - 2⁵ = 68408513 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 68408498 and 68408507.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6840850 + ... + 6840859.

It is an arithmetic number, because the mean of its divisors is an integer number (20522565).

Almost surely, 2^68408545 is an apocalyptic number.

It is an amenable number.

68408545 is a deficient number, since it is larger than the sum of its proper divisors (13681715).

68408545 is a wasteful number, since it uses less digits than its factorization.

68408545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13681714.

The product of its (nonzero) digits is 153600, while the sum is 40.

The square root of 68408545 is about 8270.9458346673. The cubic root of 68408545 is about 408.9813000698.

The spelling of 68408545 in words is "sixty-eight million, four hundred eight thousand, five hundred forty-five".