65278660 has 12 divisors (see below), whose sum is σ = 137085228. Its totient is φ = 26111456.

The previous prime is 65278637. The next prime is 65278747. The reversal of 65278660 is 6687256.

It can be written as a sum of positive squares in 2 ways, for example, as 32993536 + 32285124 = 5744^2 + 5682^2 .

It is a super-2 number, since 2×65278660² = 8522606902791200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1631947 + ... + 1631986.

It is an arithmetic number, because the mean of its divisors is an integer number (11423769).

Almost surely, 2^65278660 is an apocalyptic number.

It is an amenable number.

65278660 is an abundant number, since it is smaller than the sum of its proper divisors (71806568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65278660 is a wasteful number, since it uses less digits than its factorization.

65278660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3263942 (or 3263940 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 65278660 is about 8079.5210254074. The cubic root of 65278660 is about 402.6463287512.

The spelling of 65278660 in words is "sixty-five million, two hundred seventy-eight thousand, six hundred sixty".