64240561 has 16 divisors (see below), whose sum is σ = 80281728. Its totient is φ = 49939200.

The previous prime is 64240559. The next prime is 64240573. The reversal of 64240561 is 16504246.

It is a cyclic number.

It is not a de Polignac number, because 64240561 - 2¹ = 64240559 is a prime.

It is a super-3 number, since 3×64240561³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64240061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46521 + ... + 47881.

It is an arithmetic number, because the mean of its divisors is an integer number (5017608).

Almost surely, 2^64240561 is an apocalyptic number.

It is an amenable number.

64240561 is a deficient number, since it is larger than the sum of its proper divisors (16041167).

64240561 is a wasteful number, since it uses less digits than its factorization.

64240561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 64240561 is about 8015.0209606713. The cubic root of 64240561 is about 400.5005421327.

The spelling of 64240561 in words is "sixty-four million, two hundred forty thousand, five hundred sixty-one".