64638339 has 8 divisors (see below), whose sum is σ = 86234880. Its totient is φ = 43067016.

The previous prime is 64638337. The next prime is 64638341. The reversal of 64638339 is 93383646.

It is an interprime number because it is at equal distance from previous prime (64638337) and next prime (64638341).

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

It is not a de Polignac number, because 64638339 - 2¹ = 64638337 is a prime.

It is a super-2 number, since 2×64638339² = 8356229737357842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64638339.

It is not an unprimeable number, because it can be changed into a prime (64638337) 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, 834 + ... + 11400.

It is an arithmetic number, because the mean of its divisors is an integer number (10779360).

Almost surely, 2^64638339 is an apocalyptic number.

64638339 is a deficient number, since it is larger than the sum of its proper divisors (21596541).

64638339 is a wasteful number, since it uses less digits than its factorization.

64638339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12609.

The product of its digits is 279936, while the sum is 42.

The square root of 64638339 is about 8039.7971989348. The cubic root of 64638339 is about 401.3254758496.

The spelling of 64638339 in words is "sixty-four million, six hundred thirty-eight thousand, three hundred thirty-nine".