68827021 has 4 divisors (see below), whose sum is σ = 69075772. Its totient is φ = 68578272.

The previous prime is 68827009. The next prime is 68827043. The reversal of 68827021 is 12072886.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19980900 + 48846121 = 4470^2 + 6989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68827021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68827061) 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, 123960 + ... + 124513.

It is an arithmetic number, because the mean of its divisors is an integer number (17268943).

Almost surely, 2^68827021 is an apocalyptic number.

It is an amenable number.

68827021 is a deficient number, since it is larger than the sum of its proper divisors (248751).

68827021 is a wasteful number, since it uses less digits than its factorization.

68827021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248750.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 68827021 is about 8296.2052168446. The cubic root of 68827021 is about 409.8135598885.

The spelling of 68827021 in words is "sixty-eight million, eight hundred twenty-seven thousand, twenty-one".