28645687605 has 32 divisors (see below), whose sum is σ = 46982592000. Its totient is φ = 14896957952.

The previous prime is 28645687597. The next prime is 28645687607. The reversal of 28645687605 is 50678654682.

It is a cyclic number.

It is not a de Polignac number, because 28645687605 - 2³ = 28645687597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28645687607) 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 31 ways as a sum of consecutive naturals, for example, 114121 + ... + 265169.

It is an arithmetic number, because the mean of its divisors is an integer number (1468206000).

Almost surely, 2^28645687605 is an apocalyptic number.

It is an amenable number.

28645687605 is a deficient number, since it is larger than the sum of its proper divisors (18336904395).

28645687605 is a wasteful number, since it uses less digits than its factorization.

28645687605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151373.

The product of its (nonzero) digits is 19353600, while the sum is 57.

The spelling of 28645687605 in words is "twenty-eight billion, six hundred forty-five million, six hundred eighty-seven thousand, six hundred five".