3280742785 has 4 divisors (see below), whose sum is σ = 3936891348. Its totient is φ = 2624594224.

The previous prime is 3280742737. The next prime is 3280742791. The reversal of 3280742785 is 5872470823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5872470823 = 853 ⋅6884491.

It can be written as a sum of positive squares in 2 ways, for example, as 1069486209 + 2211256576 = 32703^2 + 47024^2 .

It is a cyclic number.

It is not a de Polignac number, because 3280742785 - 2⁷ = 3280742657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328074274 + ... + 328074283.

It is an arithmetic number, because the mean of its divisors is an integer number (984222837).

Almost surely, 2^3280742785 is an apocalyptic number.

It is an amenable number.

3280742785 is a deficient number, since it is larger than the sum of its proper divisors (656148563).

3280742785 is an equidigital number, since it uses as much as digits as its factorization.

3280742785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656148562.

The product of its (nonzero) digits is 752640, while the sum is 46.

The square root of 3280742785 is about 57277.7686803528. The cubic root of 3280742785 is about 1485.9039167182.

The spelling of 3280742785 in words is "three billion, two hundred eighty million, seven hundred forty-two thousand, seven hundred eighty-five".