63728909213 has 4 divisors (see below), whose sum is σ = 64215389568. Its totient is φ = 63242428860.

The previous prime is 63728909207. The next prime is 63728909249. The reversal of 63728909213 is 31290982736.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63728909213 - 2²⁴ = 63712131997 is a prime.

It is a super-2 number, since 2×63728909213² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63728909203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243239981 + ... + 243240242.

It is an arithmetic number, because the mean of its divisors is an integer number (16053847392).

Almost surely, 2^63728909213 is an apocalyptic number.

It is an amenable number.

63728909213 is a deficient number, since it is larger than the sum of its proper divisors (486480355).

63728909213 is a wasteful number, since it uses less digits than its factorization.

63728909213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486480354.

The product of its (nonzero) digits is 979776, while the sum is 50.

The spelling of 63728909213 in words is "sixty-three billion, seven hundred twenty-eight million, nine hundred nine thousand, two hundred thirteen".