64857841 has 4 divisors (see below), whose sum is σ = 64923892. Its totient is φ = 64791792.

The previous prime is 64857829. The next prime is 64857847. The reversal of 64857841 is 14875846.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26368225 + 38489616 = 5135^2 + 6204^2 .

It is a cyclic number.

It is not a de Polignac number, because 64857841 - 2²¹ = 62760689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64857847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31530 + ... + 33523.

It is an arithmetic number, because the mean of its divisors is an integer number (16230973).

Almost surely, 2^64857841 is an apocalyptic number.

It is an amenable number.

64857841 is a deficient number, since it is larger than the sum of its proper divisors (66051).

64857841 is an equidigital number, since it uses as much as digits as its factorization.

64857841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66050.

The product of its digits is 215040, while the sum is 43.

The square root of 64857841 is about 8053.4365956404. The cubic root of 64857841 is about 401.7792427536.

The spelling of 64857841 in words is "sixty-four million, eight hundred fifty-seven thousand, eight hundred forty-one".