63730891 has 4 divisors (see below), whose sum is σ = 72835312. Its totient is φ = 54626472.

The previous prime is 63730873. The next prime is 63730897. The reversal of 63730891 is 19803736.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63730891 - 2⁹ = 63730379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63730891.

It is not an unprimeable number, because it can be changed into a prime (63730897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4552200 + ... + 4552213.

It is an arithmetic number, because the mean of its divisors is an integer number (18208828).

Almost surely, 2^63730891 is an apocalyptic number.

63730891 is a deficient number, since it is larger than the sum of its proper divisors (9104421).

63730891 is an equidigital number, since it uses as much as digits as its factorization.

63730891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9104420.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 63730891 is about 7983.1629696506. The cubic root of 63730891 is about 399.4385686057.

The spelling of 63730891 in words is "sixty-three million, seven hundred thirty thousand, eight hundred ninety-one".