28055545 has 16 divisors (see below), whose sum is σ = 38763648. Its totient is φ = 19094400.

The previous prime is 28055539. The next prime is 28055549. The reversal of 28055545 is 54555082.

It is not a de Polignac number, because 28055545 - 2²³ = 19666937 is a prime.

It is a super-2 number, since 2×28055545² = 1574227210494050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28055545.

It is not an unprimeable number, because it can be changed into a prime (28055549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1870 + ... + 7720.

It is an arithmetic number, because the mean of its divisors is an integer number (2422728).

Almost surely, 2^28055545 is an apocalyptic number.

It is an amenable number.

28055545 is a deficient number, since it is larger than the sum of its proper divisors (10708103).

28055545 is a wasteful number, since it uses less digits than its factorization.

28055545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6000.

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

The square root of 28055545 is about 5296.7485309386. The cubic root of 28055545 is about 303.8595590041.

The spelling of 28055545 in words is "twenty-eight million, fifty-five thousand, five hundred forty-five".