3445809781 has 16 divisors (see below), whose sum is σ = 3761417520. Its totient is φ = 3143761920.

The previous prime is 3445809779. The next prime is 3445809797. The reversal of 3445809781 is 1879085443.

It can be written as a sum of positive squares in 8 ways, for example, as 127012900 + 3318796881 = 11270^2 + 57609^2 .

It is not a de Polignac number, because 3445809781 - 2¹ = 3445809779 is a prime.

It is a super-2 number, since 2×3445809781² = 23747210093670535922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3445809751) 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 15 ways as a sum of consecutive naturals, for example, 93685 + ... + 125173.

It is an arithmetic number, because the mean of its divisors is an integer number (235088595).

Almost surely, 2^3445809781 is an apocalyptic number.

It is an amenable number.

3445809781 is a deficient number, since it is larger than the sum of its proper divisors (315607739).

3445809781 is a wasteful number, since it uses less digits than its factorization.

3445809781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31704.

The product of its (nonzero) digits is 967680, while the sum is 49.

The square root of 3445809781 is about 58701.0202722235. The cubic root of 3445809781 is about 1510.4178164879.

The spelling of 3445809781 in words is "three billion, four hundred forty-five million, eight hundred nine thousand, seven hundred eighty-one".