68942136720 has 40 divisors (see below), whose sum is σ = 213720624576. Its totient is φ = 18384569728.

The previous prime is 68942136691. The next prime is 68942136721. The reversal of 68942136720 is 2763124986.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 68942136720.

It is not an unprimeable number, because it can be changed into a prime (68942136721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143629212 + ... + 143629691.

Almost surely, 2^68942136720 is an apocalyptic number.

68942136720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68942136720 is an abundant number, since it is smaller than the sum of its proper divisors (144778487856).

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

68942136720 is a wasteful number, since it uses less digits than its factorization.

68942136720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287258919 (or 287258913 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 68942136720 in words is "sixty-eight billion, nine hundred forty-two million, one hundred thirty-six thousand, seven hundred twenty".