64638853 has 16 divisors (see below), whose sum is σ = 67858560. Its totient is φ = 61528896.

The previous prime is 64638839. The next prime is 64638857. The reversal of 64638853 is 35883646.

It is a cyclic number.

It is not a de Polignac number, because 64638853 - 2⁹ = 64638341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64638857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 386976 + ... + 387142.

It is an arithmetic number, because the mean of its divisors is an integer number (4241160).

Almost surely, 2^64638853 is an apocalyptic number.

It is an amenable number.

64638853 is a deficient number, since it is larger than the sum of its proper divisors (3219707).

64638853 is a wasteful number, since it uses less digits than its factorization.

64638853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396.

The product of its digits is 414720, while the sum is 43.

The square root of 64638853 is about 8039.8291648517. The cubic root of 64638853 is about 401.3265396184.

The spelling of 64638853 in words is "sixty-four million, six hundred thirty-eight thousand, eight hundred fifty-three".