63720017 has 2 divisors, whose sum is σ = 63720018. Its totient is φ = 63720016.

The previous prime is 63720011. The next prime is 63720043. The reversal of 63720017 is 71002736.

It is an a-pointer prime, because the next prime (63720043) can be obtained adding 63720017 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60590656 + 3129361 = 7784^2 + 1769^2 .

It is a cyclic number.

It is not a de Polignac number, because 63720017 - 2⁴ = 63720001 is a prime.

It is not a weakly prime, because it can be changed into another prime (63720011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31860008 + 31860009.

It is an arithmetic number, because the mean of its divisors is an integer number (31860009).

Almost surely, 2^63720017 is an apocalyptic number.

It is an amenable number.

63720017 is a deficient number, since it is larger than the sum of its proper divisors (1).

63720017 is an equidigital number, since it uses as much as digits as its factorization.

63720017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 63720017 is about 7982.4818822218. The cubic root of 63720017 is about 399.4158494189.

The spelling of 63720017 in words is "sixty-three million, seven hundred twenty thousand, seventeen".