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28166151 = 3131938011
BaseRepresentation
bin110101101110…
…0100000000111
31221222222200210
41223130200013
524202304101
62443410503
7461260026
oct153344007
957888623
1028166151
1114998712
129523a33
135ab2380
143a528bd
1527157d6
hex1adc807

28166151 has 16 divisors (see below), whose sum is σ = 42573440. Its totient is φ = 16420320.

The previous prime is 28166147. The next prime is 28166153. The reversal of 28166151 is 15166182.

It is not a de Polignac number, because 28166151 - 22 = 28166147 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28166153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18265 + ... + 19746.

It is an arithmetic number, because the mean of its divisors is an integer number (2660840).

Almost surely, 228166151 is an apocalyptic number.

28166151 is a deficient number, since it is larger than the sum of its proper divisors (14407289).

28166151 is a wasteful number, since it uses less digits than its factorization.

28166151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38046.

The product of its digits is 2880, while the sum is 30.

The square root of 28166151 is about 5307.1791942613. The cubic root of 28166151 is about 304.2583467261.

The spelling of 28166151 in words is "twenty-eight million, one hundred sixty-six thousand, one hundred fifty-one".

Divisors: 1 3 13 19 39 57 247 741 38011 114033 494143 722209 1482429 2166627 9388717 28166151