64389639 has 8 divisors (see below), whose sum is σ = 87946992. Its totient is φ = 41879360.

The previous prime is 64389617. The next prime is 64389641. The reversal of 64389639 is 93698346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64389639 - 2¹¹ = 64387591 is a prime.

It is a super-2 number, since 2×64389639² = 8292051221100642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64389439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261624 + ... + 261869.

It is an arithmetic number, because the mean of its divisors is an integer number (10993374).

Almost surely, 2^64389639 is an apocalyptic number.

64389639 is a deficient number, since it is larger than the sum of its proper divisors (23557353).

64389639 is a wasteful number, since it uses less digits than its factorization.

64389639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523537.

The product of its digits is 839808, while the sum is 48.

The square root of 64389639 is about 8024.3154848249. The cubic root of 64389639 is about 400.8101061292.

The spelling of 64389639 in words is "sixty-four million, three hundred eighty-nine thousand, six hundred thirty-nine".