64863839 has 4 divisors (see below), whose sum is σ = 65832024. Its totient is φ = 63895656.

The previous prime is 64863817. The next prime is 64863847. The reversal of 64863839 is 93836846.

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 64863839 - 2⁸ = 64863583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64863793 and 64863802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64863809) 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, 483992 + ... + 484125.

It is an arithmetic number, because the mean of its divisors is an integer number (16458006).

Almost surely, 2^64863839 is an apocalyptic number.

64863839 is a deficient number, since it is larger than the sum of its proper divisors (968185).

64863839 is an equidigital number, since it uses as much as digits as its factorization.

64863839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968184.

The product of its digits is 746496, while the sum is 47.

The square root of 64863839 is about 8053.8089746405. The cubic root of 64863839 is about 401.7916277769.

The spelling of 64863839 in words is "sixty-four million, eight hundred sixty-three thousand, eight hundred thirty-nine".