3728506805 has 8 divisors (see below), whose sum is σ = 4558627512. Its totient is φ = 2926525888.

The previous prime is 3728506787. The next prime is 3728506841. The reversal of 3728506805 is 5086058273.

It can be written as a sum of positive squares in 4 ways, for example, as 155575729 + 3572931076 = 12473^2 + 59774^2 .

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 3728506805 - 2¹⁴ = 3728490421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7034654 + ... + 7035183.

It is an arithmetic number, because the mean of its divisors is an integer number (569828439).

Almost surely, 2^3728506805 is an apocalyptic number.

It is an amenable number.

3728506805 is a deficient number, since it is larger than the sum of its proper divisors (830120707).

3728506805 is a wasteful number, since it uses less digits than its factorization.

3728506805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14069895.

The product of its (nonzero) digits is 403200, while the sum is 44.

The square root of 3728506805 is about 61061.5001862876. The cubic root of 3728506805 is about 1550.6423705805.

The spelling of 3728506805 in words is "three billion, seven hundred twenty-eight million, five hundred six thousand, eight hundred five".