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28280280055 = 55656056011
BaseRepresentation
bin11010010101101000…
…101101001111110111
32200222220100002002211
4122111220231033313
5430404222430210
620554120314251
72020545262036
oct322550551767
980886302084
1028280280055
1110aa2531a85
125593012987
132889002a31
141523cac71d
15b07b7c38a
hex695a2d3f7

28280280055 has 4 divisors (see below), whose sum is σ = 33936336072. Its totient is φ = 22624224040.

The previous prime is 28280280053. The next prime is 28280280101. The reversal of 28280280055 is 55008208282.

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

It is not a de Polignac number, because 28280280055 - 21 = 28280280053 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28280280053) 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, 2828028001 + ... + 2828028010.

It is an arithmetic number, because the mean of its divisors is an integer number (8484084018).

Almost surely, 228280280055 is an apocalyptic number.

28280280055 is a deficient number, since it is larger than the sum of its proper divisors (5656056017).

28280280055 is an equidigital number, since it uses as much as digits as its factorization.

28280280055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5656056016.

The product of its (nonzero) digits is 102400, while the sum is 40.

The spelling of 28280280055 in words is "twenty-eight billion, two hundred eighty million, two hundred eighty thousand, fifty-five".

Divisors: 1 5 5656056011 28280280055