68784783870 has 64 divisors (see below), whose sum is σ = 181283857920. Its totient is φ = 16564656000.

The previous prime is 68784783853. The next prime is 68784783931. The reversal of 68784783870 is 7838748786.

It is a happy number.

It is a super-3 number, since 3×68784783870³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 640365 + ... + 740024.

It is an arithmetic number, because the mean of its divisors is an integer number (2832560280).

Almost surely, 2^68784783870 is an apocalyptic number.

68784783870 is an abundant number, since it is smaller than the sum of its proper divisors (112499074050).

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

68784783870 is a wasteful number, since it uses less digits than its factorization.

68784783870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380561.

The product of its (nonzero) digits is 101154816, while the sum is 66.

The spelling of 68784783870 in words is "sixty-eight billion, seven hundred eighty-four million, seven hundred eighty-three thousand, eight hundred seventy".