65784013 has 4 divisors (see below), whose sum is σ = 66118140. Its totient is φ = 65449888.

The previous prime is 65784001. The next prime is 65784031. The reversal of 65784013 is 31048756.

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 34892649 + 30891364 = 5907^2 + 5558^2 .

It is a cyclic number.

It is not a de Polignac number, because 65784013 - 2¹³ = 65775821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65784013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65784053) 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, 166768 + ... + 167161.

It is an arithmetic number, because the mean of its divisors is an integer number (16529535).

Almost surely, 2^65784013 is an apocalyptic number.

It is an amenable number.

65784013 is a deficient number, since it is larger than the sum of its proper divisors (334127).

65784013 is a wasteful number, since it uses less digits than its factorization.

65784013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334126.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 65784013 is about 8110.7344303707. The cubic root of 65784013 is about 403.6826842886.

The spelling of 65784013 in words is "sixty-five million, seven hundred eighty-four thousand, thirteen".