64218439 has 4 divisors (see below), whose sum is σ = 64724224. Its totient is φ = 63712656.

The previous prime is 64218433. The next prime is 64218463. The reversal of 64218439 is 93481246.

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

It is a cyclic number.

It is not a de Polignac number, because 64218439 - 2³ = 64218431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64218398 and 64218407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64218431) 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, 252702 + ... + 252955.

It is an arithmetic number, because the mean of its divisors is an integer number (16181056).

Almost surely, 2^64218439 is an apocalyptic number.

64218439 is a deficient number, since it is larger than the sum of its proper divisors (505785).

64218439 is a wasteful number, since it uses less digits than its factorization.

64218439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505784.

The product of its digits is 41472, while the sum is 37.

The square root of 64218439 is about 8013.6408080223. The cubic root of 64218439 is about 400.4545644821.

The spelling of 64218439 in words is "sixty-four million, two hundred eighteen thousand, four hundred thirty-nine".