68521973 has 4 divisors (see below), whose sum is σ = 73792908. Its totient is φ = 63251040.

The previous prime is 68521967. The next prime is 68522009. The reversal of 68521973 is 37912586.

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 24671089 + 43850884 = 4967^2 + 6622^2 .

It is a cyclic number.

It is not a de Polignac number, because 68521973 - 2⁶ = 68521909 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 68521973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68521903) 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, 2635448 + ... + 2635473.

It is an arithmetic number, because the mean of its divisors is an integer number (18448227).

Almost surely, 2^68521973 is an apocalyptic number.

It is an amenable number.

68521973 is a deficient number, since it is larger than the sum of its proper divisors (5270935).

68521973 is a wasteful number, since it uses less digits than its factorization.

68521973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5270934.

The product of its digits is 90720, while the sum is 41.

The square root of 68521973 is about 8277.8000096644. The cubic root of 68521973 is about 409.2072187999.

The spelling of 68521973 in words is "sixty-eight million, five hundred twenty-one thousand, nine hundred seventy-three".