65278385 has 16 divisors (see below), whose sum is σ = 83883600. Its totient is φ = 48592896.

The previous prime is 65278379. The next prime is 65278387. The reversal of 65278385 is 58387256.

It can be written as a sum of positive squares in 8 ways, for example, as 185761 + 65092624 = 431^2 + 8068^2 .

It is a cyclic number.

It is not a de Polignac number, because 65278385 - 2⁶ = 65278321 is a prime.

It is a super-2 number, since 2×65278385² = 8522535096416450, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (65278387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3251 + ... + 11879.

It is an arithmetic number, because the mean of its divisors is an integer number (5242725).

Almost surely, 2^65278385 is an apocalyptic number.

It is an amenable number.

65278385 is a deficient number, since it is larger than the sum of its proper divisors (18605215).

65278385 is a wasteful number, since it uses less digits than its factorization.

65278385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8740.

The product of its digits is 403200, while the sum is 44.

The square root of 65278385 is about 8079.5040070539. The cubic root of 65278385 is about 402.6457633398.

The spelling of 65278385 in words is "sixty-five million, two hundred seventy-eight thousand, three hundred eighty-five".