28057223766649 has 27 divisors (see below), whose sum is σ = 35875342455813. Its totient is φ = 21862453951800.

The previous prime is 28057223766631. The next prime is 28057223766703. The reversal of 28057223766649 is 94666732275082.

The square root of 28057223766649 is 5296907.

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

It is not a de Polignac number, because 28057223766649 - 2⁷ = 28057223766521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28057223764649) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 407827444 + ... + 407896234.

Almost surely, 2^{28057223766649} is an apocalyptic number.

28057223766649 is the 5296907-th square number.

28057223766649 is the 2648454-th centered octagonal number.

It is an amenable number.

28057223766649 is a deficient number, since it is larger than the sum of its proper divisors (7818118689164).

28057223766649 is an frugal number, since it uses more digits than its factorization.

28057223766649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137618 (or 68809 counting only the distinct ones).

The product of its (nonzero) digits is 365783040, while the sum is 67.

The spelling of 28057223766649 in words is "twenty-eight trillion, fifty-seven billion, two hundred twenty-three million, seven hundred sixty-six thousand, six hundred forty-nine".