28023605511 has 32 divisors (see below), whose sum is σ = 43750637568. Its totient is φ = 15765949440.

The previous prime is 28023605459. The next prime is 28023605539. The reversal of 28023605511 is 11550632082.

It is not a de Polignac number, because 28023605511 - 2⁷ = 28023605383 is a prime.

It is a super-2 number, since 2×28023605511² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28023605111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 301191 + ... + 383096.

It is an arithmetic number, because the mean of its divisors is an integer number (1367207424).

Almost surely, 2^28023605511 is an apocalyptic number.

28023605511 is a deficient number, since it is larger than the sum of its proper divisors (15727032057).

28023605511 is a wasteful number, since it uses less digits than its factorization.

28023605511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684391.

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 28023605511 in words is "twenty-eight billion, twenty-three million, six hundred five thousand, five hundred eleven".