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28168845 = 3541163281
BaseRepresentation
bin110101101110…
…1001010001101
31222000010101120
41223131022031
524202400340
62443431153
7461300625
oct153351215
958003346
1028168845
111499a741
1295254b9
135ab3673
143a53885
1527164d0

28168845 has 32 divisors (see below), whose sum is σ = 46617984. Its totient is φ = 14515200.

The previous prime is 28168843. The next prime is 28168853. The reversal of 28168845 is 54886182.

It is not a de Polignac number, because 28168845 - 21 = 28168843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28168797 and 28168806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28168841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100105 + ... + 100385.

It is an arithmetic number, because the mean of its divisors is an integer number (1456812).

Almost surely, 228168845 is an apocalyptic number.

It is an amenable number.

28168845 is a deficient number, since it is larger than the sum of its proper divisors (18449139).

28168845 is a wasteful number, since it uses less digits than its factorization.

28168845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493.

The product of its digits is 122880, while the sum is 42.

The square root of 28168845 is about 5307.4329953378. The cubic root of 28168845 is about 304.2680468546.

The spelling of 28168845 in words is "twenty-eight million, one hundred sixty-eight thousand, eight hundred forty-five".