68978647040 has 112 divisors (see below), whose sum is σ = 167877256320. Its totient is φ = 27201699840.

The previous prime is 68978647039. The next prime is 68978647043. The reversal of 68978647040 is 4074687986.

It is not an unprimeable number, because it can be changed into a prime (68978647043) 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 7 ways as a sum of consecutive naturals, for example, 2896301 + ... + 2920019.

Almost surely, 2^68978647040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68978647040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83938628160).

68978647040 is an abundant number, since it is smaller than the sum of its proper divisors (98898609280).

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

68978647040 is an equidigital number, since it uses as much as digits as its factorization.

68978647040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23821 (or 23797 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 59.

The spelling of 68978647040 in words is "sixty-eight billion, nine hundred seventy-eight million, six hundred forty-seven thousand, forty".