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28571645 = 5171572141
BaseRepresentation
bin110110011111…
…1011111111101
31222202120221002
41230333133331
524303243040
62500220045
7464566154
oct154773775
958676832
1028571645
1115145333
12969a625
135bc4acb
143b1a59b
152795a15
hex1b3f7fd

28571645 has 16 divisors (see below), whose sum is σ = 36551088. Its totient is φ = 21365760.

The previous prime is 28571639. The next prime is 28571657. The reversal of 28571645 is 54617582.

It can be written as a sum of positive squares in 8 ways, for example, as 1811716 + 26759929 = 1346^2 + 5173^2 .

It is not a de Polignac number, because 28571645 - 210 = 28570621 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28571599 and 28571608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12275 + ... + 14415.

It is an arithmetic number, because the mean of its divisors is an integer number (2284443).

Almost surely, 228571645 is an apocalyptic number.

It is an amenable number.

28571645 is a deficient number, since it is larger than the sum of its proper divisors (7979443).

28571645 is a wasteful number, since it uses less digits than its factorization.

28571645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320.

The product of its digits is 67200, while the sum is 38.

The square root of 28571645 is about 5345.2450832492. The cubic root of 28571645 is about 305.7114806505.

The spelling of 28571645 in words is "twenty-eight million, five hundred seventy-one thousand, six hundred forty-five".

Divisors: 1 5 17 85 157 785 2141 2669 10705 13345 36397 181985 336137 1680685 5714329 28571645