28045555 has 4 divisors (see below), whose sum is σ = 33654672. Its totient is φ = 22436440.

The previous prime is 28045547. The next prime is 28045559. The reversal of 28045555 is 55554082.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28045555 - 2³ = 28045547 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 28045555.

It is not an unprimeable number, because it can be changed into a prime (28045559) 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, 2804551 + ... + 2804560.

It is an arithmetic number, because the mean of its divisors is an integer number (8413668).

Almost surely, 2^28045555 is an apocalyptic number.

28045555 is a deficient number, since it is larger than the sum of its proper divisors (5609117).

28045555 is an equidigital number, since it uses as much as digits as its factorization.

28045555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5609116.

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

The square root of 28045555 is about 5295.8054156096. The cubic root of 28045555 is about 303.8234886852.

The spelling of 28045555 in words is "twenty-eight million, forty-five thousand, five hundred fifty-five".