63728013 has 8 divisors (see below), whose sum is σ = 85040928. Its totient is φ = 42450224.

The previous prime is 63728011. The next prime is 63728029. The reversal of 63728013 is 31082736.

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

It is a cyclic number.

It is not a de Polignac number, because 63728013 - 2¹ = 63728011 is a prime.

It is a super-2 number, since 2×63728013² = 8122519281856338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63728011) 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, 4206 + ... + 12047.

It is an arithmetic number, because the mean of its divisors is an integer number (10630116).

Almost surely, 2^63728013 is an apocalyptic number.

It is an amenable number.

63728013 is a deficient number, since it is larger than the sum of its proper divisors (21312915).

63728013 is a wasteful number, since it uses less digits than its factorization.

63728013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17563.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 63728013 is about 7982.9827132470. The cubic root of 63728013 is about 399.4325558151.

The spelling of 63728013 in words is "sixty-three million, seven hundred twenty-eight thousand, thirteen".