68829821 has 4 divisors (see below), whose sum is σ = 72878652. Its totient is φ = 64780992.

The previous prime is 68829797. The next prime is 68829833. The reversal of 68829821 is 12892886.

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 48804196 + 20025625 = 6986^2 + 4475^2 .

It is a cyclic number.

It is not a de Polignac number, because 68829821 - 2⁶ = 68829757 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 (68829851) 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, 2024390 + ... + 2024423.

It is an arithmetic number, because the mean of its divisors is an integer number (18219663).

Almost surely, 2^68829821 is an apocalyptic number.

It is an amenable number.

68829821 is a deficient number, since it is larger than the sum of its proper divisors (4048831).

68829821 is a wasteful number, since it uses less digits than its factorization.

68829821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4048830.

The product of its digits is 110592, while the sum is 44.

The square root of 68829821 is about 8296.3739669810. The cubic root of 68829821 is about 409.8191171168.

The spelling of 68829821 in words is "sixty-eight million, eight hundred twenty-nine thousand, eight hundred twenty-one".