28907140441 has 3 divisors (see below), whose sum is σ = 28907310463. Its totient is φ = 28906970420.

The previous prime is 28907140403. The next prime is 28907140499. The reversal of 28907140441 is 14404170982.

The square root of 28907140441 is 170021.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14404170982 = 2 ⋅7202085491.

It can be written as a sum of positive squares in only one way, i.e., 16376576841 + 12530563600 = 127971^2 + 111940^2 .

It is not a de Polignac number, because 28907140441 - 2¹⁵ = 28907107673 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28907140394 and 28907140403.

It is not an unprimeable number, because it can be changed into a prime (28907149441) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 85011 + ... + 255031.

Almost surely, 2^28907140441 is an apocalyptic number.

28907140441 is the 170021-st square number.

28907140441 is the 85011-st centered octagonal number.

It is an amenable number.

28907140441 is a deficient number, since it is larger than the sum of its proper divisors (170022).

28907140441 is an frugal number, since it uses more digits than its factorization.

28907140441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340042 (or 170021 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 28907140441 in words is "twenty-eight billion, nine hundred seven million, one hundred forty thousand, four hundred forty-one".