28540555 has 8 divisors (see below), whose sum is σ = 34296912. Its totient is φ = 22800288.

The previous prime is 28540549. The next prime is 28540571. The reversal of 28540555 is 55504582.

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 28540555 - 2⁷ = 28540427 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28540555.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309 + ... + 7561.

It is an arithmetic number, because the mean of its divisors is an integer number (4287114).

Almost surely, 2^28540555 is an apocalyptic number.

28540555 is a deficient number, since it is larger than the sum of its proper divisors (5756357).

28540555 is an equidigital number, since it uses as much as digits as its factorization.

28540555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8045.

The product of its (nonzero) digits is 40000, while the sum is 34.

The square root of 28540555 is about 5342.3360994980. The cubic root of 28540555 is about 305.6005545970.

The spelling of 28540555 in words is "twenty-eight million, five hundred forty thousand, five hundred fifty-five".