64240145 has 4 divisors (see below), whose sum is σ = 77088180. Its totient is φ = 51392112.

The previous prime is 64240139. The next prime is 64240147. The reversal of 64240145 is 54104246.

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 40043584 + 24196561 = 6328^2 + 4919^2 .

It is a cyclic number.

It is not a de Polignac number, because 64240145 - 2⁴ = 64240129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64240147) 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, 6424010 + ... + 6424019.

It is an arithmetic number, because the mean of its divisors is an integer number (19272045).

Almost surely, 2^64240145 is an apocalyptic number.

It is an amenable number.

64240145 is a deficient number, since it is larger than the sum of its proper divisors (12848035).

64240145 is a wasteful number, since it uses less digits than its factorization.

64240145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12848034.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 64240145 is about 8014.9950093559. The cubic root of 64240145 is about 400.4996776291.

The spelling of 64240145 in words is "sixty-four million, two hundred forty thousand, one hundred forty-five".