28006660286 has 32 divisors (see below), whose sum is σ = 48397886208. Its totient is φ = 12030082240.

The previous prime is 28006660277. The next prime is 28006660289. The reversal of 28006660286 is 68206660082.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28006660289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291431 + ... + 375426.

It is an arithmetic number, because the mean of its divisors is an integer number (1512433944).

Almost surely, 2^28006660286 is an apocalyptic number.

28006660286 is a deficient number, since it is larger than the sum of its proper divisors (20391225922).

28006660286 is a wasteful number, since it uses less digits than its factorization.

28006660286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666976.

The product of its (nonzero) digits is 331776, while the sum is 44.

The spelling of 28006660286 in words is "twenty-eight billion, six million, six hundred sixty thousand, two hundred eighty-six".