63721629 has 6 divisors (see below), whose sum is σ = 92042366. Its totient is φ = 42481080.

The previous prime is 63721589. The next prime is 63721639. The reversal of 63721629 is 92612736.

63721629 is a `hidden beast` number, since 6 + 3 + 7 + 21 + 629 = 666.

63721629 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 52229529 + 11492100 = 7227^2 + 3390^2 .

It is not a de Polignac number, because 63721629 - 2⁷ = 63721501 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63721593 and 63721602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63721639) 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 5 ways as a sum of consecutive naturals, for example, 3540082 + ... + 3540099.

Almost surely, 2^63721629 is an apocalyptic number.

It is an amenable number.

63721629 is a deficient number, since it is larger than the sum of its proper divisors (28320737).

63721629 is a wasteful number, since it uses less digits than its factorization.

63721629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7080187 (or 7080184 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 63721629 is about 7982.5828526862. The cubic root of 63721629 is about 399.4192175542.

It can be divided in two parts, 6372 and 1629, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 63721629 in words is "sixty-three million, seven hundred twenty-one thousand, six hundred twenty-nine".