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28533505 = 5711135701
BaseRepresentation
bin110110011011…
…0001100000001
31222200122121111
41230312030001
524301033010
62455323321
7464350030
oct154661401
958618544
1028533505
1115119710
129680541
135bb0640
143b0a717
15278958a
hex1b36301

28533505 has 32 divisors (see below), whose sum is σ = 45980928. Its totient is φ = 16416000.

The previous prime is 28533469. The next prime is 28533509. The reversal of 28533505 is 50533582.

It is not a de Polignac number, because 28533505 - 217 = 28402433 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28533509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2155 + ... + 7855.

It is an arithmetic number, because the mean of its divisors is an integer number (1436904).

It is the magic constant of a 385 × 385 magic square.

Almost surely, 228533505 is an apocalyptic number.

It is an amenable number.

28533505 is a deficient number, since it is larger than the sum of its proper divisors (17447423).

28533505 is a wasteful number, since it uses less digits than its factorization.

28533505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5737.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 28533505 is about 5341.6762350408. The cubic root of 28533505 is about 305.5753896889.

The spelling of 28533505 in words is "twenty-eight million, five hundred thirty-three thousand, five hundred five".

Divisors: 1 5 7 11 13 35 55 65 77 91 143 385 455 715 1001 5005 5701 28505 39907 62711 74113 199535 313555 370565 438977 518791 815243 2194885 2593955 4076215 5706701 28533505