68919621 has 4 divisors (see below), whose sum is σ = 91892832. Its totient is φ = 45946412.

The previous prime is 68919607. The next prime is 68919623. The reversal of 68919621 is 12691986.

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 68919621 - 2⁵ = 68919589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68919623) 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 3 ways as a sum of consecutive naturals, for example, 11486601 + ... + 11486606.

It is an arithmetic number, because the mean of its divisors is an integer number (22973208).

Almost surely, 2^68919621 is an apocalyptic number.

It is an amenable number.

68919621 is a deficient number, since it is larger than the sum of its proper divisors (22973211).

68919621 is a wasteful number, since it uses less digits than its factorization.

68919621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22973210.

The product of its digits is 46656, while the sum is 42.

The square root of 68919621 is about 8301.7842058199. The cubic root of 68919621 is about 409.9972654983.

The spelling of 68919621 in words is "sixty-eight million, nine hundred nineteen thousand, six hundred twenty-one".