68870728840 has 16 divisors (see below), whose sum is σ = 154959139980. Its totient is φ = 27548291520.

The previous prime is 68870728699. The next prime is 68870728847. The reversal of 68870728840 is 4882707886.

It can be written as a sum of positive squares in 2 ways, for example, as 62599039204 + 6271689636 = 250198^2 + 79194^2 .

It is not an unprimeable number, because it can be changed into a prime (68870728847) 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, 860884071 + ... + 860884150.

Almost surely, 2^68870728840 is an apocalyptic number.

It is an amenable number.

68870728840 is an abundant number, since it is smaller than the sum of its proper divisors (86088411140).

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

68870728840 is a wasteful number, since it uses less digits than its factorization.

68870728840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721768232 (or 1721768228 counting only the distinct ones).

The product of its (nonzero) digits is 9633792, while the sum is 58.

The spelling of 68870728840 in words is "sixty-eight billion, eight hundred seventy million, seven hundred twenty-eight thousand, eight hundred forty".