64242785 has 4 divisors (see below), whose sum is σ = 77091348. Its totient is φ = 51394224.

The previous prime is 64242751. The next prime is 64242791. The reversal of 64242785 is 58724246.

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 11723776 + 52519009 = 3424^2 + 7247^2 .

It is a cyclic number.

It is not a de Polignac number, because 64242785 - 2¹⁶ = 64177249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6424274 + ... + 6424283.

It is an arithmetic number, because the mean of its divisors is an integer number (19272837).

Almost surely, 2^64242785 is an apocalyptic number.

It is an amenable number.

64242785 is a deficient number, since it is larger than the sum of its proper divisors (12848563).

64242785 is a wasteful number, since it uses less digits than its factorization.

64242785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12848562.

The product of its digits is 107520, while the sum is 38.

The square root of 64242785 is about 8015.1596989704. The cubic root of 64242785 is about 400.5051638385.

The spelling of 64242785 in words is "sixty-four million, two hundred forty-two thousand, seven hundred eighty-five".