65767813 has 4 divisors (see below), whose sum is σ = 67371948. Its totient is φ = 64163680.

The previous prime is 65767811. The next prime is 65767901. The reversal of 65767813 is 31876756.

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 34597924 + 31169889 = 5882^2 + 5583^2 .

It is a cyclic number.

It is not a de Polignac number, because 65767813 - 2¹ = 65767811 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 65767813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65767811) 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, 802006 + ... + 802087.

It is an arithmetic number, because the mean of its divisors is an integer number (16842987).

Almost surely, 2^65767813 is an apocalyptic number.

It is an amenable number.

65767813 is a deficient number, since it is larger than the sum of its proper divisors (1604135).

65767813 is a wasteful number, since it uses less digits than its factorization.

65767813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604134.

The product of its digits is 211680, while the sum is 43.

The square root of 65767813 is about 8109.7356923638. The cubic root of 65767813 is about 403.6495445430.

The spelling of 65767813 in words is "sixty-five million, seven hundred sixty-seven thousand, eight hundred thirteen".