28601606181 has 4 divisors (see below), whose sum is σ = 38135474912. Its totient is φ = 19067737452.

The previous prime is 28601606177. The next prime is 28601606221. The reversal of 28601606181 is 18160610682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28601606181 - 2² = 28601606177 is a prime.

It is a super-2 number, since 2×28601606181² (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 (28601606581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4766934361 + ... + 4766934366.

It is an arithmetic number, because the mean of its divisors is an integer number (9533868728).

Almost surely, 2^28601606181 is an apocalyptic number.

It is an amenable number.

28601606181 is a deficient number, since it is larger than the sum of its proper divisors (9533868731).

28601606181 is an equidigital number, since it uses as much as digits as its factorization.

28601606181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9533868730.

The product of its (nonzero) digits is 27648, while the sum is 39.

The spelling of 28601606181 in words is "twenty-eight billion, six hundred one million, six hundred six thousand, one hundred eighty-one".