68509540 has 24 divisors (see below), whose sum is σ = 156949632. Its totient is φ = 24912480.

The previous prime is 68509537. The next prime is 68509543. The reversal of 68509540 is 4590586.

It is an interprime number because it is at equal distance from previous prime (68509537) and next prime (68509543).

It is a self number, because there is not a number n which added to its sum of digits gives 68509540.

It is not an unprimeable number, because it can be changed into a prime (68509543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155484 + ... + 155923.

It is an arithmetic number, because the mean of its divisors is an integer number (6539568).

Almost surely, 2^68509540 is an apocalyptic number.

It is an amenable number.

68509540 is an abundant number, since it is smaller than the sum of its proper divisors (88440092).

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

68509540 is a wasteful number, since it uses less digits than its factorization.

68509540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311427 (or 311425 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 68509540 is about 8277.0489910354. The cubic root of 68509540 is about 409.1824677073.

The spelling of 68509540 in words is "sixty-eight million, five hundred nine thousand, five hundred forty".