28351265660505 has 32 divisors (see below), whose sum is σ = 50431916304000. Its totient is φ = 15111775146816.

The previous prime is 28351265660489. The next prime is 28351265660507. The reversal of 28351265660505 is 50506656215382.

28351265660505 is a `hidden beast` number, since 2 + 8 + 3 + 5 + 1 + 26 + 5 + 6 + 605 + 0 + 5 = 666.

It is not a de Polignac number, because 28351265660505 - 2⁴ = 28351265660489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28351265660507) 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 31 ways as a sum of consecutive naturals, for example, 61574454 + ... + 62033183.

It is an arithmetic number, because the mean of its divisors is an integer number (1575997384500).

Almost surely, 2^{28351265660505} is an apocalyptic number.

It is an amenable number.

28351265660505 is a deficient number, since it is larger than the sum of its proper divisors (22080650643495).

28351265660505 is a wasteful number, since it uses less digits than its factorization.

28351265660505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123609350 (or 123609344 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 54.

The spelling of 28351265660505 in words is "twenty-eight trillion, three hundred fifty-one billion, two hundred sixty-five million, six hundred sixty thousand, five hundred five".