28321155511 has 8 divisors (see below), whose sum is σ = 30971350800. Its totient is φ = 25683551040.

The previous prime is 28321155497. The next prime is 28321155517. The reversal of 28321155511 is 11555112382.

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

It is a cyclic number.

It is not a de Polignac number, because 28321155511 - 2⁵ = 28321155479 is a prime.

It is a super-2 number, since 2×28321155511² (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 (28321155517) 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, 3142996 + ... + 3151993.

It is an arithmetic number, because the mean of its divisors is an integer number (3871418850).

Almost surely, 2^28321155511 is an apocalyptic number.

28321155511 is a deficient number, since it is larger than the sum of its proper divisors (2650195289).

28321155511 is a wasteful number, since it uses less digits than its factorization.

28321155511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6295409.

The product of its digits is 12000, while the sum is 34.

Adding to 28321155511 its reverse (11555112382), we get a palindrome (39876267893).

The spelling of 28321155511 in words is "twenty-eight billion, three hundred twenty-one million, one hundred fifty-five thousand, five hundred eleven".