68218737 has 4 divisors (see below), whose sum is σ = 90958320. Its totient is φ = 45479156.

The previous prime is 68218727. The next prime is 68218741. The reversal of 68218737 is 73781286.

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 68218737 - 2¹⁵ = 68185969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68218727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11369787 + ... + 11369792.

It is an arithmetic number, because the mean of its divisors is an integer number (22739580).

Almost surely, 2^68218737 is an apocalyptic number.

It is an amenable number.

68218737 is a deficient number, since it is larger than the sum of its proper divisors (22739583).

68218737 is a wasteful number, since it uses less digits than its factorization.

68218737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22739582.

The product of its digits is 112896, while the sum is 42.

The square root of 68218737 is about 8259.4634813649. The cubic root of 68218737 is about 408.6026932277.

The spelling of 68218737 in words is "sixty-eight million, two hundred eighteen thousand, seven hundred thirty-seven".