28628906011 has 4 divisors (see below), whose sum is σ = 28640346352. Its totient is φ = 28617465672.

The previous prime is 28628906003. The next prime is 28628906023. The reversal of 28628906011 is 11060982682.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11060982682 = 2 ⋅5530491341.

It is a cyclic number.

It is not a de Polignac number, because 28628906011 - 2³ = 28628906003 is a prime.

It is a super-2 number, since 2×28628906011² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28628906071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5716416 + ... + 5721421.

It is an arithmetic number, because the mean of its divisors is an integer number (7160086588).

Almost surely, 2^28628906011 is an apocalyptic number.

28628906011 is a deficient number, since it is larger than the sum of its proper divisors (11440341).

28628906011 is a wasteful number, since it uses less digits than its factorization.

28628906011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11440340.

The product of its (nonzero) digits is 82944, while the sum is 43.

The spelling of 28628906011 in words is "twenty-eight billion, six hundred twenty-eight million, nine hundred six thousand, eleven".