63720043 has 2 divisors, whose sum is σ = 63720044. Its totient is φ = 63720042.

The previous prime is 63720017. The next prime is 63720049. The reversal of 63720043 is 34002736.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63720043 - 2⁵ = 63720011 is a prime.

It is not a weakly prime, because it can be changed into another prime (63720049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31860021 + 31860022.

It is an arithmetic number, because the mean of its divisors is an integer number (31860022).

Almost surely, 2^63720043 is an apocalyptic number.

63720043 is a deficient number, since it is larger than the sum of its proper divisors (1).

63720043 is an equidigital number, since it uses as much as digits as its factorization.

63720043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 25.

The square root of 63720043 is about 7982.4835107879. The cubic root of 63720043 is about 399.4159037441.

Adding to 63720043 its reverse (34002736), we get a palindrome (97722779).

The spelling of 63720043 in words is "sixty-three million, seven hundred twenty thousand, forty-three".