68726816964 has 81 divisors (see below), whose sum is σ = 188173620999. Its totient is φ = 21140421120.

The previous prime is 68726816959. The next prime is 68726816969. The reversal of 68726816964 is 46961862786.

The square root of 68726816964 is 262158.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (68726816959) and next prime (68726816969).

It can be written as a sum of positive squares in 4 ways, for example, as 1130976900 + 67595840064 = 33630^2 + 259992^2 .

It is not an unprimeable number, because it can be changed into a prime (68726816969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 20446644 + ... + 20450004.

Almost surely, 2^68726816964 is an apocalyptic number.

68726816964 is the 262158-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68726816964

68726816964 is an abundant number, since it is smaller than the sum of its proper divisors (119446804035).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68726816964 is a wasteful number, since it uses less digits than its factorization.

68726816964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6758 (or 3379 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 63.

The spelling of 68726816964 in words is "sixty-eight billion, seven hundred twenty-six million, eight hundred sixteen thousand, nine hundred sixty-four".