68285839784 has 8 divisors (see below), whose sum is σ = 128035949610. Its totient is φ = 34142919888.

The previous prime is 68285839781. The next prime is 68285839807. The reversal of 68285839784 is 48793858286.

It can be written as a sum of positive squares in only one way, i.e., 45296608900 + 22989230884 = 212830^2 + 151622^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×68285839784² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68285839781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4267864979 + ... + 4267864994.

Almost surely, 2^68285839784 is an apocalyptic number.

It is an amenable number.

68285839784 is a deficient number, since it is larger than the sum of its proper divisors (59750109826).

68285839784 is a wasteful number, since it uses less digits than its factorization.

68285839784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8535729979 (or 8535729975 counting only the distinct ones).

The product of its digits is 185794560, while the sum is 68.

The spelling of 68285839784 in words is "sixty-eight billion, two hundred eighty-five million, eight hundred thirty-nine thousand, seven hundred eighty-four".