64856853 has 24 divisors (see below), whose sum is σ = 100128600. Its totient is φ = 40310784.

The previous prime is 64856843. The next prime is 64856863. The reversal of 64856853 is 35865846.

It is an interprime number because it is at equal distance from previous prime (64856843) and next prime (64856863).

It can be written as a sum of positive squares in 4 ways, for example, as 30669444 + 34187409 = 5538^2 + 5847^2 .

It is not a de Polignac number, because 64856853 - 2⁵ = 64856821 is a prime.

It is a super-2 number, since 2×64856853² = 8412822762127218, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64856799 and 64856808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64856833) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14733 + ... + 18621.

It is an arithmetic number, because the mean of its divisors is an integer number (4172025).

Almost surely, 2^64856853 is an apocalyptic number.

It is an amenable number.

64856853 is a deficient number, since it is larger than the sum of its proper divisors (35271747).

64856853 is a wasteful number, since it uses less digits than its factorization.

64856853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4021 (or 4018 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 64856853 is about 8053.3752551337. The cubic root of 64856853 is about 401.7772025998. Note that the first 3 decimals are identical.

The spelling of 64856853 in words is "sixty-four million, eight hundred fifty-six thousand, eight hundred fifty-three".