28205078011 has 8 divisors (see below), whose sum is σ = 31139889984. Its totient is φ = 25332051720.

The previous prime is 28205078003. The next prime is 28205078023. The reversal of 28205078011 is 11087050282.

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 28205078011 - 2³ = 28205078003 is a prime.

It is a super-2 number, since 2×28205078011² (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 (28205078051) 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, 15445461 + ... + 15447286.

It is an arithmetic number, because the mean of its divisors is an integer number (3892486248).

Almost surely, 2^28205078011 is an apocalyptic number.

28205078011 is a deficient number, since it is larger than the sum of its proper divisors (2934811973).

28205078011 is a wasteful number, since it uses less digits than its factorization.

28205078011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30892841.

The product of its (nonzero) digits is 8960, while the sum is 34.

The spelling of 28205078011 in words is "twenty-eight billion, two hundred five million, seventy-eight thousand, eleven".