28081207850217 has 16 divisors (see below), whose sum is σ = 37487498939520. Its totient is φ = 18697866595200.

The previous prime is 28081207850207. The next prime is 28081207850231. The reversal of 28081207850217 is 71205870218082.

It is a happy number.

It is not a de Polignac number, because 28081207850217 - 2⁶ = 28081207850153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28081207850217.

It is not an unprimeable number, because it can be changed into a prime (28081207850207) 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, 19488367 + ... + 20879627.

It is an arithmetic number, because the mean of its divisors is an integer number (2342968683720).

Almost surely, 2^{28081207850217} is an apocalyptic number.

It is an amenable number.

28081207850217 is a deficient number, since it is larger than the sum of its proper divisors (9406291089303).

28081207850217 is a wasteful number, since it uses less digits than its factorization.

28081207850217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399504.

The product of its (nonzero) digits is 1003520, while the sum is 51.

The spelling of 28081207850217 in words is "twenty-eight trillion, eighty-one billion, two hundred seven million, eight hundred fifty thousand, two hundred seventeen".