68504509 has 4 divisors (see below), whose sum is σ = 72534204. Its totient is φ = 64474816.

The previous prime is 68504507. The next prime is 68504551. The reversal of 68504509 is 90540586.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40678884 + 27825625 = 6378^2 + 5275^2 .

It is a cyclic number.

It is not a de Polignac number, because 68504509 - 2¹ = 68504507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68504507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2014822 + ... + 2014855.

It is an arithmetic number, because the mean of its divisors is an integer number (18133551).

Almost surely, 2^68504509 is an apocalyptic number.

It is an amenable number.

68504509 is a deficient number, since it is larger than the sum of its proper divisors (4029695).

68504509 is a wasteful number, since it uses less digits than its factorization.

68504509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4029694.

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

The square root of 68504509 is about 8276.7450727928. The cubic root of 68504509 is about 409.1724513534.

The spelling of 68504509 in words is "sixty-eight million, five hundred four thousand, five hundred nine".