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28588728643 = 31922217053
BaseRepresentation
bin11010101000000001…
…010110000101000011
32201210101201220000121
4122220001112011003
5432022203304033
621044455401111
72031312120046
oct325001260503
981711656017
1028588728643
1111140656a72
12565a383197
132907b9b1a7
141552c40c5d
15b24ca962d
hex6a8056143

28588728643 has 4 divisors (see below), whose sum is σ = 29510945728. Its totient is φ = 27666511560.

The previous prime is 28588728631. The next prime is 28588728653. The reversal of 28588728643 is 34682788582.

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

It is a cyclic number.

It is not a de Polignac number, because 28588728643 - 29 = 28588728131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28588728653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461108496 + ... + 461108557.

It is an arithmetic number, because the mean of its divisors is an integer number (7377736432).

Almost surely, 228588728643 is an apocalyptic number.

28588728643 is a deficient number, since it is larger than the sum of its proper divisors (922217085).

28588728643 is an equidigital number, since it uses as much as digits as its factorization.

28588728643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922217084.

The product of its digits is 41287680, while the sum is 61.

The spelling of 28588728643 in words is "twenty-eight billion, five hundred eighty-eight million, seven hundred twenty-eight thousand, six hundred forty-three".

Divisors: 1 31 922217053 28588728643