68672881 has 4 divisors (see below), whose sum is σ = 69339712. Its totient is φ = 68006052.

The previous prime is 68672867. The next prime is 68672887. The reversal of 68672881 is 18827686.

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 a de Polignac number, because none of the positive numbers 2^k-68672881 is a prime.

It is a super-2 number, since 2×68672881² = 9431929169680322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68672887) 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, 333261 + ... + 333466.

It is an arithmetic number, because the mean of its divisors is an integer number (17334928).

Almost surely, 2^68672881 is an apocalyptic number.

It is an amenable number.

68672881 is a deficient number, since it is larger than the sum of its proper divisors (666831).

68672881 is a wasteful number, since it uses less digits than its factorization.

68672881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666830.

The product of its digits is 258048, while the sum is 46.

The square root of 68672881 is about 8286.9102203415. The cubic root of 68672881 is about 409.5074016581.

The spelling of 68672881 in words is "sixty-eight million, six hundred seventy-two thousand, eight hundred eighty-one".