64489647 has 4 divisors (see below), whose sum is σ = 85986200. Its totient is φ = 42993096.

The previous prime is 64489643. The next prime is 64489661. The reversal of 64489647 is 74698446.

64489647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 64489647 - 2² = 64489643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64489596 and 64489605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64489643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10748272 + ... + 10748277.

It is an arithmetic number, because the mean of its divisors is an integer number (21496550).

Almost surely, 2^64489647 is an apocalyptic number.

64489647 is a deficient number, since it is larger than the sum of its proper divisors (21496553).

64489647 is a wasteful number, since it uses less digits than its factorization.

64489647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21496552.

The product of its digits is 1161216, while the sum is 48.

The square root of 64489647 is about 8030.5446266116. The cubic root of 64489647 is about 401.0175074186.

The spelling of 64489647 in words is "sixty-four million, four hundred eighty-nine thousand, six hundred forty-seven".