68747921 has 8 divisors (see below), whose sum is σ = 76269600. Its totient is φ = 61438240.

The previous prime is 68747873. The next prime is 68747923. The reversal of 68747921 is 12974786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68747921 - 2¹⁰ = 68746897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68747923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52316 + ... + 53613.

It is an arithmetic number, because the mean of its divisors is an integer number (9533700).

Almost surely, 2^68747921 is an apocalyptic number.

It is an amenable number.

68747921 is a deficient number, since it is larger than the sum of its proper divisors (7521679).

68747921 is a wasteful number, since it uses less digits than its factorization.

68747921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105999.

The product of its digits is 169344, while the sum is 44.

The square root of 68747921 is about 8291.4366065236. The cubic root of 68747921 is about 409.6565058795.

The spelling of 68747921 in words is "sixty-eight million, seven hundred forty-seven thousand, nine hundred twenty-one".