63720619 has 2 divisors, whose sum is σ = 63720620. Its totient is φ = 63720618.

The previous prime is 63720589. The next prime is 63720667. The reversal of 63720619 is 91602736.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63720619 - 2²⁵ = 30166187 is a prime.

It is a super-2 number, since 2×63720619² = 8120634571486322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63720119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31860309 + 31860310.

It is an arithmetic number, because the mean of its divisors is an integer number (31860310).

Almost surely, 2^63720619 is an apocalyptic number.

63720619 is a deficient number, since it is larger than the sum of its proper divisors (1).

63720619 is an equidigital number, since it uses as much as digits as its factorization.

63720619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 63720619 is about 7982.5195897035. The cubic root of 63720619 is about 399.4171072527.

The spelling of 63720619 in words is "sixty-three million, seven hundred twenty thousand, six hundred nineteen".