264407785 has 4 divisors (see below), whose sum is σ = 317289348. Its totient is φ = 211526224.

The previous prime is 264407779. The next prime is 264407789. The reversal of 264407785 is 587704462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 587704462 = 2 ⋅293852231.

It can be written as a sum of positive squares in 2 ways, for example, as 33489369 + 230918416 = 5787^2 + 15196^2 .

It is a cyclic number.

It is not a de Polignac number, because 264407785 - 2⁷ = 264407657 is a prime.

It is a super-2 number, since 2×264407785² = 139822953537212450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264407789) 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, 26440774 + ... + 26440783.

It is an arithmetic number, because the mean of its divisors is an integer number (79322337).

Almost surely, 2^264407785 is an apocalyptic number.

It is an amenable number.

264407785 is a deficient number, since it is larger than the sum of its proper divisors (52881563).

264407785 is an equidigital number, since it uses as much as digits as its factorization.

264407785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52881562.

The product of its (nonzero) digits is 376320, while the sum is 43.

The square root of 264407785 is about 16260.6206831105. The cubic root of 264407785 is about 641.8369951681.

It can be divided in two parts, 26440 and 7785, that added together give a square (34225 = 185²).

The spelling of 264407785 in words is "two hundred sixty-four million, four hundred seven thousand, seven hundred eighty-five".