28396520869657 has 32 divisors (see below), whose sum is σ = 30870843586560. Its totient is φ = 26042522626560.

The previous prime is 28396520869609. The next prime is 28396520869721. The reversal of 28396520869657 is 75696802569382.

It is a cyclic number.

It is not a de Polignac number, because 28396520869657 - 2¹⁵ = 28396520836889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28396520899657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49434063 + ... + 50005195.

It is an arithmetic number, because the mean of its divisors is an integer number (964713862080).

Almost surely, 2^{28396520869657} is an apocalyptic number.

It is an amenable number.

28396520869657 is a deficient number, since it is larger than the sum of its proper divisors (2474322716903).

28396520869657 is a wasteful number, since it uses less digits than its factorization.

28396520869657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571833.

The product of its (nonzero) digits is 2351462400, while the sum is 76.

The spelling of 28396520869657 in words is "twenty-eight trillion, three hundred ninety-six billion, five hundred twenty million, eight hundred sixty-nine thousand, six hundred fifty-seven".