63512721 has 8 divisors (see below), whose sum is σ = 94092960. Its totient is φ = 42341796.

The previous prime is 63512711. The next prime is 63512723. The reversal of 63512721 is 12721536.

It is a happy number.

63512721 is a `hidden beast` number, since 635 + 1 + 2 + 7 + 21 = 666.

It is not a de Polignac number, because 63512721 - 2¹⁵ = 63479953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2352323 = 63512721 / (6 + 3 + 5 + 1 + 2 + 7 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (63512723) 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, 1176135 + ... + 1176188.

It is an arithmetic number, because the mean of its divisors is an integer number (11761620).

Almost surely, 2^63512721 is an apocalyptic number.

It is an amenable number.

63512721 is a deficient number, since it is larger than the sum of its proper divisors (30580239).

63512721 is a wasteful number, since it uses less digits than its factorization.

63512721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2352332 (or 2352326 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 63512721 is about 7969.4868718130. The cubic root of 63512721 is about 398.9822480654.

The spelling of 63512721 in words is "sixty-three million, five hundred twelve thousand, seven hundred twenty-one".