28555081 has 8 divisors (see below), whose sum is σ = 30109280. Its totient is φ = 27006048.

The previous prime is 28555069. The next prime is 28555091. The reversal of 28555081 is 18055582.

It is a happy number.

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 28555081 - 2⁵ = 28555049 is a prime.

It is a super-2 number, since 2×28555081² = 1630785301833122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28555091) 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, 16405 + ... + 18061.

It is an arithmetic number, because the mean of its divisors is an integer number (3763660).

Almost surely, 2^28555081 is an apocalyptic number.

It is an amenable number.

28555081 is a deficient number, since it is larger than the sum of its proper divisors (1554199).

28555081 is a wasteful number, since it uses less digits than its factorization.

28555081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583.

The product of its (nonzero) digits is 16000, while the sum is 34.

The square root of 28555081 is about 5343.6954441660. The cubic root of 28555081 is about 305.6523919533.

The spelling of 28555081 in words is "twenty-eight million, five hundred fifty-five thousand, eighty-one".