28666889487 has 6 divisors (see below), whose sum is σ = 41407729272. Its totient is φ = 19111259652.

The previous prime is 28666889473. The next prime is 28666889519. The reversal of 28666889487 is 78498866682.

It is not a de Polignac number, because 28666889487 - 2⁶ = 28666889423 is a prime.

It is a super-2 number, since 2×28666889487² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28666889467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1592604963 + ... + 1592604980.

It is an arithmetic number, because the mean of its divisors is an integer number (6901288212).

Almost surely, 2^28666889487 is an apocalyptic number.

28666889487 is a deficient number, since it is larger than the sum of its proper divisors (12740839785).

28666889487 is a wasteful number, since it uses less digits than its factorization.

28666889487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3185209949 (or 3185209946 counting only the distinct ones).

The product of its digits is 445906944, while the sum is 72.

The spelling of 28666889487 in words is "twenty-eight billion, six hundred sixty-six million, eight hundred eighty-nine thousand, four hundred eighty-seven".