64638211 has 8 divisors (see below), whose sum is σ = 73580544. Its totient is φ = 56206920.

The previous prime is 64638191. The next prime is 64638229. The reversal of 64638211 is 11283646.

It is a happy number.

64638211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 64638211 - 2¹¹ = 64636163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64638241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127491 + ... + 127996.

It is an arithmetic number, because the mean of its divisors is an integer number (9197568).

Almost surely, 2^64638211 is an apocalyptic number.

64638211 is a deficient number, since it is larger than the sum of its proper divisors (8942333).

64638211 is a wasteful number, since it uses less digits than its factorization.

64638211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255521.

The product of its digits is 6912, while the sum is 31.

The square root of 64638211 is about 8039.7892385311. The cubic root of 64638211 is about 401.3252109413.

The spelling of 64638211 in words is "sixty-four million, six hundred thirty-eight thousand, two hundred eleven".