68217477 has 4 divisors (see below), whose sum is σ = 90956640. Its totient is φ = 45478316.

The previous prime is 68217473. The next prime is 68217491. The reversal of 68217477 is 77471286.

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 68217477 - 2² = 68217473 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68217473) 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, 11369577 + ... + 11369582.

It is an arithmetic number, because the mean of its divisors is an integer number (22739160).

Almost surely, 2^68217477 is an apocalyptic number.

It is an amenable number.

68217477 is a deficient number, since it is larger than the sum of its proper divisors (22739163).

68217477 is a wasteful number, since it uses less digits than its factorization.

68217477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22739162.

The product of its digits is 131712, while the sum is 42.

The square root of 68217477 is about 8259.3872048718. The cubic root of 68217477 is about 408.6001775818.

The spelling of 68217477 in words is "sixty-eight million, two hundred seventeen thousand, four hundred seventy-seven".