68220505 has 16 divisors (see below), whose sum is σ = 83341440. Its totient is φ = 53601408.

The previous prime is 68220497. The next prime is 68220511. The reversal of 68220505 is 50502286.

It is a cyclic number.

It is not a de Polignac number, because 68220505 - 2³ = 68220497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71109 + ... + 72061.

It is an arithmetic number, because the mean of its divisors is an integer number (5208840).

Almost surely, 2^68220505 is an apocalyptic number.

It is an amenable number.

68220505 is a deficient number, since it is larger than the sum of its proper divisors (15120935).

68220505 is a wasteful number, since it uses less digits than its factorization.

68220505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 68220505 is about 8259.5705094151. The cubic root of 68220505 is about 408.6062230660.

The spelling of 68220505 in words is "sixty-eight million, two hundred twenty thousand, five hundred five".