65780417 has 4 divisors (see below), whose sum is σ = 65888340. Its totient is φ = 65672496.

The previous prime is 65780389. The next prime is 65780423. The reversal of 65780417 is 71408756.

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 3701776 + 62078641 = 1924^2 + 7879^2 .

It is a cyclic number.

It is not a de Polignac number, because 65780417 - 2¹⁴ = 65764033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65780917) 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, 53042 + ... + 54267.

It is an arithmetic number, because the mean of its divisors is an integer number (16472085).

Almost surely, 2^65780417 is an apocalyptic number.

It is an amenable number.

65780417 is a deficient number, since it is larger than the sum of its proper divisors (107923).

65780417 is a wasteful number, since it uses less digits than its factorization.

65780417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107922.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 65780417 is about 8110.5127458133. The cubic root of 65780417 is about 403.6753285532.

The spelling of 65780417 in words is "sixty-five million, seven hundred eighty thousand, four hundred seventeen".