28856081 has 4 divisors (see below), whose sum is σ = 29125872. Its totient is φ = 28586292.

The previous prime is 28856077. The next prime is 28856101. The reversal of 28856081 is 18065882.

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 a cyclic number.

It is not a de Polignac number, because 28856081 - 2² = 28856077 is a prime.

It is a super-2 number, since 2×28856081² = 1665346821357122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28856981) 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, 134735 + ... + 134948.

It is an arithmetic number, because the mean of its divisors is an integer number (7281468).

Almost surely, 2^28856081 is an apocalyptic number.

It is an amenable number.

28856081 is a deficient number, since it is larger than the sum of its proper divisors (269791).

28856081 is a wasteful number, since it uses less digits than its factorization.

28856081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269790.

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 28856081 is about 5371.7856435267. The cubic root of 28856081 is about 306.7226041366.

The spelling of 28856081 in words is "twenty-eight million, eight hundred fifty-six thousand, eighty-one".