28761787689 has 16 divisors (see below), whose sum is σ = 38470778880. Its totient is φ = 19113751440.

The previous prime is 28761787679. The next prime is 28761787699. The reversal of 28761787689 is 98678716782.

It is an interprime number because it is at equal distance from previous prime (28761787679) and next prime (28761787699).

It is not a de Polignac number, because 28761787689 - 2¹¹ = 28761785641 is a prime.

It is a super-2 number, since 2×28761787689² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28761787679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1343064 + ... + 1364310.

It is an arithmetic number, because the mean of its divisors is an integer number (2404423680).

Almost surely, 2^28761787689 is an apocalyptic number.

It is an amenable number.

28761787689 is a deficient number, since it is larger than the sum of its proper divisors (9708991191).

28761787689 is a wasteful number, since it uses less digits than its factorization.

28761787689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22660.

The product of its digits is 113799168, while the sum is 69.

The spelling of 28761787689 in words is "twenty-eight billion, seven hundred sixty-one million, seven hundred eighty-seven thousand, six hundred eighty-nine".