63128671 has 4 divisors (see below), whose sum is σ = 64319832. Its totient is φ = 61937512.

The previous prime is 63128581. The next prime is 63128683. The reversal of 63128671 is 17682136.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63128671 - 2⁷ = 63128543 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 (63128071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 595501 + ... + 595606.

It is an arithmetic number, because the mean of its divisors is an integer number (16079958).

Almost surely, 2^63128671 is an apocalyptic number.

63128671 is a deficient number, since it is larger than the sum of its proper divisors (1191161).

63128671 is a wasteful number, since it uses less digits than its factorization.

63128671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191160.

The product of its digits is 12096, while the sum is 34.

The square root of 63128671 is about 7945.3553098650. The cubic root of 63128671 is about 398.1764303681.

The spelling of 63128671 in words is "sixty-three million, one hundred twenty-eight thousand, six hundred seventy-one".