28001611 has 8 divisors (see below), whose sum is σ = 32155200. Its totient is φ = 24116040.

The previous prime is 28001609. The next prime is 28001621. The reversal of 28001611 is 11610082.

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 28001611 - 2¹ = 28001609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (28001621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66781 + ... + 67198.

It is an arithmetic number, because the mean of its divisors is an integer number (4019400).

Almost surely, 2^28001611 is an apocalyptic number.

28001611 is the 2367-th centered decagonal number.

28001611 is a deficient number, since it is larger than the sum of its proper divisors (4153589).

28001611 is a wasteful number, since it uses less digits than its factorization.

28001611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134009.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 28001611 is about 5291.6548451312. The cubic root of 28001611 is about 303.6647208197.

Adding to 28001611 its reverse (11610082), we get a palindrome (39611693).

The spelling of 28001611 in words is "twenty-eight million, one thousand, six hundred eleven".