68722589690 has 8 divisors (see below), whose sum is σ = 123700661460. Its totient is φ = 27489035872.

The previous prime is 68722589669. The next prime is 68722589713. The reversal of 68722589690 is 9698522786.

It can be written as a sum of positive squares in 2 ways, for example, as 68721049609 + 1540081 = 262147^2 + 1241^2 .

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

It is a super-2 number, since 2×68722589690² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3436129475 + ... + 3436129494.

Almost surely, 2^68722589690 is an apocalyptic number.

68722589690 is a deficient number, since it is larger than the sum of its proper divisors (54978071770).

68722589690 is a wasteful number, since it uses less digits than its factorization.

68722589690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6872258976.

The product of its (nonzero) digits is 26127360, while the sum is 62.

The spelling of 68722589690 in words is "sixty-eight billion, seven hundred twenty-two million, five hundred eighty-nine thousand, six hundred ninety".