65720047 has 4 divisors (see below), whose sum is σ = 65810440. Its totient is φ = 65629656.

The previous prime is 65720027. The next prime is 65720059. The reversal of 65720047 is 74002756.

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 65720047 - 2⁷ = 65719919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65720027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44097 + ... + 45562.

It is an arithmetic number, because the mean of its divisors is an integer number (16452610).

Almost surely, 2^65720047 is an apocalyptic number.

65720047 is a deficient number, since it is larger than the sum of its proper divisors (90393).

65720047 is an equidigital number, since it uses as much as digits as its factorization.

65720047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90392.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 65720047 is about 8106.7901786095. The cubic root of 65720047 is about 403.5517996994.

The spelling of 65720047 in words is "sixty-five million, seven hundred twenty thousand, forty-seven".