63449721 has 36 divisors (see below), whose sum is σ = 98663760. Its totient is φ = 39275280.

The previous prime is 63449689. The next prime is 63449753. The reversal of 63449721 is 12794436.

63449721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (63449689) and next prime (63449753).

It is not a de Polignac number, because 63449721 - 2⁵ = 63449689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63442721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 191526 + ... + 191856.

It is an arithmetic number, because the mean of its divisors is an integer number (2740660).

Almost surely, 2^63449721 is an apocalyptic number.

It is an amenable number.

63449721 is a deficient number, since it is larger than the sum of its proper divisors (35214039).

63449721 is a wasteful number, since it uses less digits than its factorization.

63449721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 412 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 63449721 is about 7965.5333154786. The cubic root of 63449721 is about 398.8502839654.

The spelling of 63449721 in words is "sixty-three million, four hundred forty-nine thousand, seven hundred twenty-one".