68220591 has 4 divisors (see below), whose sum is σ = 90960792. Its totient is φ = 45480392.

The previous prime is 68220587. The next prime is 68220623. The reversal of 68220591 is 19502286.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68220591 - 2² = 68220587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68220511) 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, 11370096 + ... + 11370101.

It is an arithmetic number, because the mean of its divisors is an integer number (22740198).

Almost surely, 2^68220591 is an apocalyptic number.

68220591 is a deficient number, since it is larger than the sum of its proper divisors (22740201).

68220591 is a wasteful number, since it uses less digits than its factorization.

68220591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22740200.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 68220591 is about 8259.5757154953. The cubic root of 68220591 is about 408.6063947647.

The spelling of 68220591 in words is "sixty-eight million, two hundred twenty thousand, five hundred ninety-one".