28730030172889 has 4 divisors (see below), whose sum is σ = 28888759621540. Its totient is φ = 28571300724240.

The previous prime is 28730030172871. The next prime is 28730030172913. The reversal of 28730030172889 is 98827103003782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10743100962889 + 17986929210000 = 3277667^2 + 4241100^2 .

It is a cyclic number.

It is not a de Polignac number, because 28730030172889 - 2¹⁹ = 28730029648601 is a prime.

It is a super-2 number, since 2×28730030172889² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28730030172829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79364724054 + ... + 79364724415.

It is an arithmetic number, because the mean of its divisors is an integer number (7222189905385).

Almost surely, 2^{28730030172889} is an apocalyptic number.

It is an amenable number.

28730030172889 is a deficient number, since it is larger than the sum of its proper divisors (158729448651).

28730030172889 is a wasteful number, since it uses less digits than its factorization.

28730030172889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158729448650.

The product of its (nonzero) digits is 8128512, while the sum is 58.

The spelling of 28730030172889 in words is "twenty-eight trillion, seven hundred thirty billion, thirty million, one hundred seventy-two thousand, eight hundred eighty-nine".