68513643 has 24 divisors (see below), whose sum is σ = 109025280. Its totient is φ = 41114160.

The previous prime is 68513629. The next prime is 68513647. The reversal of 68513643 is 34631586.

68513643 is a `hidden beast` number, since 6 + 8 + 5 + 1 + 3 + 643 = 666.

It is not a de Polignac number, because 68513643 - 2¹² = 68509547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68513598 and 68513607.

It is not an unprimeable number, because it can be changed into a prime (68513647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6838 + ... + 13556.

It is an arithmetic number, because the mean of its divisors is an integer number (4542720).

Almost surely, 2^68513643 is an apocalyptic number.

68513643 is a deficient number, since it is larger than the sum of its proper divisors (40511637).

68513643 is a wasteful number, since it uses less digits than its factorization.

68513643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6839 (or 6836 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 68513643 is about 8277.2968413607. The cubic root of 68513643 is about 409.1906361178.

The spelling of 68513643 in words is "sixty-eight million, five hundred thirteen thousand, six hundred forty-three".