68285357520 has 80 divisors (see below), whose sum is σ = 211894330752. Its totient is φ = 18191388160.

The previous prime is 68285357489. The next prime is 68285357521. The reversal of 68285357520 is 2575358286.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68285357521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102685 + ... + 383555.

Almost surely, 2^68285357520 is an apocalyptic number.

68285357520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68285357520 is an abundant number, since it is smaller than the sum of its proper divisors (143608973232).

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

68285357520 is a wasteful number, since it uses less digits than its factorization.

68285357520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281900 (or 281894 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 51.

The spelling of 68285357520 in words is "sixty-eight billion, two hundred eighty-five million, three hundred fifty-seven thousand, five hundred twenty".