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28405327 = 43660589
BaseRepresentation
bin110110001011…
…0111001001111
31222110010210011
41230112321033
524232432302
62452454051
7463304236
oct154267117
958403704
1028405327
1115041385
12961a327
135b671b2
143ab5b1d
1527615d7
hex1b16e4f

28405327 has 4 divisors (see below), whose sum is σ = 29065960. Its totient is φ = 27744696.

The previous prime is 28405303. The next prime is 28405337. The reversal of 28405327 is 72350482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72350482 = 236175241.

It is a cyclic number.

It is not a de Polignac number, because 28405327 - 215 = 28372559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28405337) 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, 330252 + ... + 330337.

It is an arithmetic number, because the mean of its divisors is an integer number (7266490).

Almost surely, 228405327 is an apocalyptic number.

28405327 is a deficient number, since it is larger than the sum of its proper divisors (660633).

28405327 is an equidigital number, since it uses as much as digits as its factorization.

28405327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660632.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 28405327 is about 5329.6648112241. The cubic root of 28405327 is about 305.1171349782.

The spelling of 28405327 in words is "twenty-eight million, four hundred five thousand, three hundred twenty-seven".

Divisors: 1 43 660589 28405327