65005405 has 16 divisors (see below), whose sum is σ = 79467120. Its totient is φ = 51038208.

The previous prime is 65005363. The next prime is 65005427. The reversal of 65005405 is 50450056.

It can be written as a sum of positive squares in 8 ways, for example, as 19131876 + 45873529 = 4374^2 + 6773^2 .

It is a cyclic number.

It is not a de Polignac number, because 65005405 - 2¹¹ = 65003357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65005405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113961 + ... + 114529.

It is an arithmetic number, because the mean of its divisors is an integer number (4966695).

Almost surely, 2^65005405 is an apocalyptic number.

It is an amenable number.

65005405 is a deficient number, since it is larger than the sum of its proper divisors (14461715).

65005405 is a wasteful number, since it uses less digits than its factorization.

65005405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 65005405 is about 8062.5929452007. The cubic root of 65005405 is about 402.0837201771.

The spelling of 65005405 in words is "sixty-five million, five thousand, four hundred five".