64450709 has 4 divisors (see below), whose sum is σ = 65507340. Its totient is φ = 63394080.

The previous prime is 64450699. The next prime is 64450733. The reversal of 64450709 is 90705446.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5499025 + 58951684 = 2345^2 + 7678^2 .

It is a cyclic number.

It is not a de Polignac number, because 64450709 - 2⁴ = 64450693 is a prime.

It is a super-3 number, since 3×64450709³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64450759) 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, 528224 + ... + 528345.

It is an arithmetic number, because the mean of its divisors is an integer number (16376835).

Almost surely, 2^64450709 is an apocalyptic number.

It is an amenable number.

64450709 is a deficient number, since it is larger than the sum of its proper divisors (1056631).

64450709 is a wasteful number, since it uses less digits than its factorization.

64450709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056630.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 64450709 is about 8028.1198919797. The cubic root of 64450709 is about 400.9367814718.

The spelling of 64450709 in words is "sixty-four million, four hundred fifty thousand, seven hundred nine".