28191128554369 has 8 divisors (see below), whose sum is σ = 30757308272640. Its totient is φ = 25625507144400.

The previous prime is 28191128554327. The next prime is 28191128554417. The reversal of 28191128554369 is 96345582119182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28191128554369 is a prime.

It is a super-2 number, since 2×28191128554369² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28191128554369.

It is not an unprimeable number, because it can be changed into a prime (28191128554969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139471489 + ... + 139673470.

It is an arithmetic number, because the mean of its divisors is an integer number (3844663534080).

Almost surely, 2^{28191128554369} is an apocalyptic number.

It is an amenable number.

28191128554369 is a deficient number, since it is larger than the sum of its proper divisors (2566179718271).

28191128554369 is a wasteful number, since it uses less digits than its factorization.

28191128554369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279154151.

The product of its digits is 37324800, while the sum is 64.

The spelling of 28191128554369 in words is "twenty-eight trillion, one hundred ninety-one billion, one hundred twenty-eight million, five hundred fifty-four thousand, three hundred sixty-nine".