28645721877 has 16 divisors (see below), whose sum is σ = 40052600640. Its totient is φ = 18186037632.

The previous prime is 28645721873. The next prime is 28645721879. The reversal of 28645721877 is 77812754682.

It is not a de Polignac number, because 28645721877 - 2² = 28645721873 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28645721873) 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, 2248863 + ... + 2261564.

It is an arithmetic number, because the mean of its divisors is an integer number (2503287540).

Almost surely, 2^28645721877 is an apocalyptic number.

It is an amenable number.

28645721877 is a deficient number, since it is larger than the sum of its proper divisors (11406878763).

28645721877 is a wasteful number, since it uses less digits than its factorization.

28645721877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510532.

The product of its digits is 10536960, while the sum is 57.

The spelling of 28645721877 in words is "twenty-eight billion, six hundred forty-five million, seven hundred twenty-one thousand, eight hundred seventy-seven".