64842857 has 2 divisors, whose sum is σ = 64842858. Its totient is φ = 64842856.

The previous prime is 64842787. The next prime is 64842859. The reversal of 64842857 is 75824846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50922496 + 13920361 = 7136^2 + 3731^2 .

It is a cyclic number.

It is not a de Polignac number, because 64842857 - 2⁸ = 64842601 is a prime.

It is a super-2 number, since 2×64842857² = 8409192207844898, which contains 22 as substring.

Together with 64842859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64842859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32421428 + 32421429.

It is an arithmetic number, because the mean of its divisors is an integer number (32421429).

Almost surely, 2^64842857 is an apocalyptic number.

It is an amenable number.

64842857 is a deficient number, since it is larger than the sum of its proper divisors (1).

64842857 is an equidigital number, since it uses as much as digits as its factorization.

64842857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 430080, while the sum is 44.

The square root of 64842857 is about 8052.5062558187. The cubic root of 64842857 is about 401.7482995720.

The spelling of 64842857 in words is "sixty-four million, eight hundred forty-two thousand, eight hundred fifty-seven".