28064443517 has 4 divisors (see below), whose sum is σ = 30615756576. Its totient is φ = 25513130460.

The previous prime is 28064443507. The next prime is 28064443549. The reversal of 28064443517 is 71534446082.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28064443517 - 2⁸ = 28064443261 is a prime.

It is a super-2 number, since 2×28064443517² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28064443507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1275656513 + ... + 1275656534.

It is an arithmetic number, because the mean of its divisors is an integer number (7653939144).

Almost surely, 2^28064443517 is an apocalyptic number.

It is an amenable number.

28064443517 is a deficient number, since it is larger than the sum of its proper divisors (2551313059).

28064443517 is a wasteful number, since it uses less digits than its factorization.

28064443517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551313058.

The product of its (nonzero) digits is 645120, while the sum is 44.

Adding to 28064443517 its reverse (71534446082), we get a palindrome (99598889599).

The spelling of 28064443517 in words is "twenty-eight billion, sixty-four million, four hundred forty-three thousand, five hundred seventeen".