64255729 has 4 divisors (see below), whose sum is σ = 64278900. Its totient is φ = 64232560.

The previous prime is 64255703. The next prime is 64255759. The reversal of 64255729 is 92755246.

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 26801329 + 37454400 = 5177^2 + 6120^2 .

It is a cyclic number.

It is not a de Polignac number, because 64255729 - 2⁷ = 64255601 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64255691 and 64255700.

It is not an unprimeable number, because it can be changed into a prime (64255759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6754 + ... + 13195.

It is an arithmetic number, because the mean of its divisors is an integer number (16069725).

Almost surely, 2^64255729 is an apocalyptic number.

It is an amenable number.

64255729 is a deficient number, since it is larger than the sum of its proper divisors (23171).

64255729 is a wasteful number, since it uses less digits than its factorization.

64255729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23170.

The product of its digits is 151200, while the sum is 40.

The square root of 64255729 is about 8015.9671281761. The cubic root of 64255729 is about 400.5320607147.

The spelling of 64255729 in words is "sixty-four million, two hundred fifty-five thousand, seven hundred twenty-nine".