64727641 has 4 divisors (see below), whose sum is σ = 70611984. Its totient is φ = 58843300.

The previous prime is 64727609. The next prime is 64727651. The reversal of 64727641 is 14672746.

It is the 3285-th star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64727641 - 2⁵ = 64727609 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 64727641.

It is not an unprimeable number, because it can be changed into a prime (64727651) 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, 2942155 + ... + 2942176.

It is an arithmetic number, because the mean of its divisors is an integer number (17652996).

Almost surely, 2^64727641 is an apocalyptic number.

It is an amenable number.

64727641 is a deficient number, since it is larger than the sum of its proper divisors (5884343).

64727641 is a wasteful number, since it uses less digits than its factorization.

64727641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5884342.

The product of its digits is 56448, while the sum is 37.

The square root of 64727641 is about 8045.3490290975. The cubic root of 64727641 is about 401.5102097405.

The spelling of 64727641 in words is "sixty-four million, seven hundred twenty-seven thousand, six hundred forty-one".