64218399 has 16 divisors (see below), whose sum is σ = 97985280. Its totient is φ = 36648000.

The previous prime is 64218397. The next prime is 64218431. The reversal of 64218399 is 99381246.

It is not a de Polignac number, because 64218399 - 2¹ = 64218397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64218399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64218397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19899 + ... + 22899.

It is an arithmetic number, because the mean of its divisors is an integer number (6124080).

Almost surely, 2^64218399 is an apocalyptic number.

64218399 is a deficient number, since it is larger than the sum of its proper divisors (33766881).

64218399 is a wasteful number, since it uses less digits than its factorization.

64218399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030.

The product of its digits is 93312, while the sum is 42.

The square root of 64218399 is about 8013.6383122774. The cubic root of 64218399 is about 400.4544813379.

The spelling of 64218399 in words is "sixty-four million, two hundred eighteen thousand, three hundred ninety-nine".