28607378217 has 12 divisors (see below), whose sum is σ = 41612145264. Its totient is φ = 17337216120.

The previous prime is 28607378183. The next prime is 28607378237. The reversal of 28607378217 is 71287370682.

It is a happy number.

It is not a de Polignac number, because 28607378217 - 2¹¹ = 28607376169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28607378217.

It is not an unprimeable number, because it can be changed into a prime (28607378237) 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 11 ways as a sum of consecutive naturals, for example, 956898 + ... + 986340.

It is an arithmetic number, because the mean of its divisors is an integer number (3467678772).

Almost surely, 2^28607378217 is an apocalyptic number.

It is an amenable number.

28607378217 is a deficient number, since it is larger than the sum of its proper divisors (13004767047).

28607378217 is an frugal number, since it uses more digits than its factorization.

28607378217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58900 (or 29457 counting only the distinct ones).

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

The spelling of 28607378217 in words is "twenty-eight billion, six hundred seven million, three hundred seventy-eight thousand, two hundred seventeen".