28689687637 has 16 divisors (see below), whose sum is σ = 31300496640. Its totient is φ = 26136856512.

The previous prime is 28689687589. The next prime is 28689687641. The reversal of 28689687637 is 73678698682.

It is a de Polignac number, because none of the positive numbers 2^k-28689687637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28689687647) 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 15 ways as a sum of consecutive naturals, for example, 3624438 + ... + 3632344.

It is an arithmetic number, because the mean of its divisors is an integer number (1956281040).

Almost surely, 2^28689687637 is an apocalyptic number.

It is an amenable number.

28689687637 is a deficient number, since it is larger than the sum of its proper divisors (2610809003).

28689687637 is a wasteful number, since it uses less digits than its factorization.

28689687637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11532.

The product of its digits is 292626432, while the sum is 70.

The spelling of 28689687637 in words is "twenty-eight billion, six hundred eighty-nine million, six hundred eighty-seven thousand, six hundred thirty-seven".