68708921 has 4 divisors (see below), whose sum is σ = 72325200. Its totient is φ = 65092644.

The previous prime is 68708911. The next prime is 68708953. The reversal of 68708921 is 12980786.

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 68708921 - 2¹⁴ = 68692537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68708911) 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, 1808111 + ... + 1808148.

It is an arithmetic number, because the mean of its divisors is an integer number (18081300).

Almost surely, 2^68708921 is an apocalyptic number.

It is an amenable number.

68708921 is a deficient number, since it is larger than the sum of its proper divisors (3616279).

68708921 is a wasteful number, since it uses less digits than its factorization.

68708921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3616278.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 68708921 is about 8289.0844488399. The cubic root of 68708921 is about 409.5790265629.

The spelling of 68708921 in words is "sixty-eight million, seven hundred eight thousand, nine hundred twenty-one".