28445571242187 has 64 divisors (see below), whose sum is σ = 42879029698560. Its totient is φ = 16623527356800.

The previous prime is 28445571242171. The next prime is 28445571242191. The reversal of 28445571242187 is 78124217554482.

It is a happy number.

It is not a de Polignac number, because 28445571242187 - 2⁴ = 28445571242171 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28445571242187.

It is not an unprimeable number, because it can be changed into a prime (28445571242167) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1430062512 + ... + 1430082402.

It is an arithmetic number, because the mean of its divisors is an integer number (669984839040).

Almost surely, 2^{28445571242187} is an apocalyptic number.

28445571242187 is a deficient number, since it is larger than the sum of its proper divisors (14433458456373).

28445571242187 is a wasteful number, since it uses less digits than its factorization.

28445571242187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32784.

The product of its digits is 40140800, while the sum is 60.

The spelling of 28445571242187 in words is "twenty-eight trillion, four hundred forty-five billion, five hundred seventy-one million, two hundred forty-two thousand, one hundred eighty-seven".