3728781728429 has 8 divisors (see below), whose sum is σ = 3732933669432. Its totient is φ = 3724630191360.

The previous prime is 3728781728393. The next prime is 3728781728431. The reversal of 3728781728429 is 9248271878273.

It can be written as a sum of positive squares in 4 ways, for example, as 45625814404 + 3683155914025 = 213602^2 + 1919155^2 .

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 3728781728429 - 2⁸ = 3728781728173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3728781728449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20756537 + ... + 20935409.

It is an arithmetic number, because the mean of its divisors is an integer number (466616708679).

Almost surely, 2^{3728781728429} is an apocalyptic number.

It is an amenable number.

3728781728429 is a deficient number, since it is larger than the sum of its proper divisors (4151941003).

3728781728429 is a wasteful number, since it uses less digits than its factorization.

3728781728429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201967.

The product of its digits is 151732224, while the sum is 68.

The spelling of 3728781728429 in words is "three trillion, seven hundred twenty-eight billion, seven hundred eighty-one million, seven hundred twenty-eight thousand, four hundred twenty-nine".