68866881 has 8 divisors (see below), whose sum is σ = 97223904. Its totient is φ = 43210560.

The previous prime is 68866877. The next prime is 68866883. The reversal of 68866881 is 18866886.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68866881 - 2² = 68866877 is a prime.

It is a super-2 number, since 2×68866881² = 9485294597336322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 1350331 = 68866881 / (6 + 8 + 8 + 6 + 6 + 8 + 8 + 1).

It is not an unprimeable number, because it can be changed into a prime (68866883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 675115 + ... + 675216.

It is an arithmetic number, because the mean of its divisors is an integer number (12152988).

Almost surely, 2^68866881 is an apocalyptic number.

68866881 is the 5249-th centered pentagonal number.

It is an amenable number.

68866881 is a deficient number, since it is larger than the sum of its proper divisors (28357023).

68866881 is a wasteful number, since it uses less digits than its factorization.

68866881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350351.

The product of its digits is 884736, while the sum is 51.

The square root of 68866881 is about 8298.6071722910. The cubic root of 68866881 is about 409.8926568084.

The spelling of 68866881 in words is "sixty-eight million, eight hundred sixty-six thousand, eight hundred eighty-one".