28605081 has 8 divisors (see below), whose sum is σ = 38245504. Its totient is φ = 19017360.

The previous prime is 28605079. The next prime is 28605091. The reversal of 28605081 is 18050682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28605081 - 2¹ = 28605079 is a prime.

It is a super-2 number, since 2×28605081² = 1636501318033122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28605061) 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, 11890 + ... + 14091.

It is an arithmetic number, because the mean of its divisors is an integer number (4780688).

Almost surely, 2^28605081 is an apocalyptic number.

It is an amenable number.

28605081 is a deficient number, since it is larger than the sum of its proper divisors (9640423).

28605081 is a wasteful number, since it uses less digits than its factorization.

28605081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26351.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 28605081 is about 5348.3718083170. The cubic root of 28605081 is about 305.8306872311.

The spelling of 28605081 in words is "twenty-eight million, six hundred five thousand, eighty-one".