3145728746 has 4 divisors (see below), whose sum is σ = 4718593122. Its totient is φ = 1572864372.

The previous prime is 3145728701. The next prime is 3145728757. The reversal of 3145728746 is 6478275413.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3140369521 + 5359225 = 56039^2 + 2315^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3145728746.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 786432185 + ... + 786432188.

Almost surely, 2^3145728746 is an apocalyptic number.

3145728746 is a deficient number, since it is larger than the sum of its proper divisors (1572864376).

3145728746 is a wasteful number, since it uses less digits than its factorization.

3145728746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572864375.

The product of its digits is 1128960, while the sum is 47.

The square root of 3145728746 is about 56086.7965389360. The cubic root of 3145728746 is about 1465.2343462936.

The spelling of 3145728746 in words is "three billion, one hundred forty-five million, seven hundred twenty-eight thousand, seven hundred forty-six".