64136281 has 12 divisors (see below), whose sum is σ = 71925840. Its totient is φ = 56716560.

The previous prime is 64136269. The next prime is 64136321. The reversal of 64136281 is 18263146.

It is a happy number.

64136281 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 64136281 - 2⁵ = 64136249 is a prime.

It is a super-2 number, since 2×64136281² = 8226925081021922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64136221) 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 11 ways as a sum of consecutive naturals, for example, 12930 + ... + 17188.

It is an arithmetic number, because the mean of its divisors is an integer number (5993820).

Almost surely, 2^64136281 is an apocalyptic number.

It is an amenable number.

64136281 is a deficient number, since it is larger than the sum of its proper divisors (7789559).

64136281 is a wasteful number, since it uses less digits than its factorization.

64136281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4344 (or 4307 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 64136281 is about 8008.5130330168. The cubic root of 64136281 is about 400.2837174634.

The spelling of 64136281 in words is "sixty-four million, one hundred thirty-six thousand, two hundred eighty-one".