63485721 has 16 divisors (see below), whose sum is σ = 101288320. Its totient is φ = 39067920.

The previous prime is 63485713. The next prime is 63485731. The reversal of 63485721 is 12758436.

It is not a de Polignac number, because 63485721 - 2³ = 63485713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63485731) 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, 90085 + ... + 90786.

It is an arithmetic number, because the mean of its divisors is an integer number (6330520).

Almost surely, 2^63485721 is an apocalyptic number.

It is an amenable number.

63485721 is a deficient number, since it is larger than the sum of its proper divisors (37802599).

63485721 is a wasteful number, since it uses less digits than its factorization.

63485721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180893 (or 180887 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 63485721 is about 7967.7927307379. The cubic root of 63485721 is about 398.9257027131.

The spelling of 63485721 in words is "sixty-three million, four hundred eighty-five thousand, seven hundred twenty-one".