28638127707 has 32 divisors (see below), whose sum is σ = 43783483392. Its totient is φ = 16310584704.

The previous prime is 28638127673. The next prime is 28638127709. The reversal of 28638127707 is 70772183682.

It is a happy number.

It is not a de Polignac number, because 28638127707 - 2⁸ = 28638127451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28638127707.

It is not an unprimeable number, because it can be changed into a prime (28638127709) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10093093 + ... + 10095929.

It is an arithmetic number, because the mean of its divisors is an integer number (1368233856).

Almost surely, 2^28638127707 is an apocalyptic number.

28638127707 is a deficient number, since it is larger than the sum of its proper divisors (15145355685).

28638127707 is a wasteful number, since it uses less digits than its factorization.

28638127707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4267.

The product of its (nonzero) digits is 1580544, while the sum is 51.

The spelling of 28638127707 in words is "twenty-eight billion, six hundred thirty-eight million, one hundred twenty-seven thousand, seven hundred seven".