64686281 has 16 divisors (see below), whose sum is σ = 74124288. Its totient is φ = 55875600.

The previous prime is 64686277. The next prime is 64686287. The reversal of 64686281 is 18268646.

64686281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64686281 - 2² = 64686277 is a prime.

It is a super-2 number, since 2×64686281² = 8368629899221922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64686287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41486 + ... + 43016.

It is an arithmetic number, because the mean of its divisors is an integer number (4632768).

Almost surely, 2^64686281 is an apocalyptic number.

It is an amenable number.

64686281 is a deficient number, since it is larger than the sum of its proper divisors (9438007).

64686281 is a wasteful number, since it uses less digits than its factorization.

64686281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1732.

The product of its digits is 110592, while the sum is 41.

The square root of 64686281 is about 8042.7781891583. The cubic root of 64686281 is about 401.4246718345.

The spelling of 64686281 in words is "sixty-four million, six hundred eighty-six thousand, two hundred eighty-one".