68721841 has 4 divisors (see below), whose sum is σ = 72338800. Its totient is φ = 65104884.

The previous prime is 68721799. The next prime is 68721847. The reversal of 68721841 is 14812786.

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 68721841 - 2¹³ = 68713649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68721841.

It is not an unprimeable number, because it can be changed into a prime (68721847) 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, 1808451 + ... + 1808488.

It is an arithmetic number, because the mean of its divisors is an integer number (18084700).

Almost surely, 2^68721841 is an apocalyptic number.

It is an amenable number.

68721841 is a deficient number, since it is larger than the sum of its proper divisors (3616959).

68721841 is a wasteful number, since it uses less digits than its factorization.

68721841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3616958.

The product of its digits is 21504, while the sum is 37.

The square root of 68721841 is about 8289.8637503882. The cubic root of 68721841 is about 409.6046973167.

The spelling of 68721841 in words is "sixty-eight million, seven hundred twenty-one thousand, eight hundred forty-one".