2064881257 has 8 divisors (see below), whose sum is σ = 2094697800. Its totient is φ = 2035211904.

The previous prime is 2064881249. The next prime is 2064881267. The reversal of 2064881257 is 7521884602.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 161391616 + 1903489641 = 12704^2 + 43629^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2064881257 - 2³ = 2064881249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2064881207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8382 + ... + 64807.

It is an arithmetic number, because the mean of its divisors is an integer number (261837225).

Almost surely, 2^2064881257 is an apocalyptic number.

It is an amenable number.

2064881257 is a deficient number, since it is larger than the sum of its proper divisors (29816543).

2064881257 is an equidigital number, since it uses as much as digits as its factorization.

2064881257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73595.

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 2064881257 is about 45440.9645254147. The cubic root of 2064881257 is about 1273.4005332550.

The spelling of 2064881257 in words is "two billion, sixty-four million, eight hundred eighty-one thousand, two hundred fifty-seven".