64856447 has 2 divisors, whose sum is σ = 64856448. Its totient is φ = 64856446.

The previous prime is 64856437. The next prime is 64856453. The reversal of 64856447 is 74465846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64856447 - 2¹² = 64852351 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64856398 and 64856407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64856437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32428223 + 32428224.

It is an arithmetic number, because the mean of its divisors is an integer number (32428224).

Almost surely, 2^64856447 is an apocalyptic number.

64856447 is a deficient number, since it is larger than the sum of its proper divisors (1).

64856447 is an equidigital number, since it uses as much as digits as its factorization.

64856447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 645120, while the sum is 44.

The square root of 64856447 is about 8053.3500482718. The cubic root of 64856447 is about 401.7763642310.

The spelling of 64856447 in words is "sixty-four million, eight hundred fifty-six thousand, four hundred forty-seven".