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28981644 = 2232415137
BaseRepresentation
bin110111010001…
…1100110001100
32000112102100020
41232203212030
524404403034
62513102140
7501224406
oct156434614
960472306
1028981644
11153a537a
129857950
136009603
143bc5b76
152827249
hex1ba398c

28981644 has 12 divisors (see below), whose sum is σ = 67623864. Its totient is φ = 9660544.

The previous prime is 28981637. The next prime is 28981661. The reversal of 28981644 is 44618982.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×289816443 (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28981596 and 28981605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1207557 + ... + 1207580.

It is an arithmetic number, because the mean of its divisors is an integer number (5635322).

Almost surely, 228981644 is an apocalyptic number.

It is an amenable number.

28981644 is an abundant number, since it is smaller than the sum of its proper divisors (38642220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28981644 is a wasteful number, since it uses less digits than its factorization.

28981644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415144 (or 2415142 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 28981644 is about 5383.4602255427. The cubic root of 28981644 is about 307.1668465334.

The spelling of 28981644 in words is "twenty-eight million, nine hundred eighty-one thousand, six hundred forty-four".

Divisors: 1 2 3 4 6 12 2415137 4830274 7245411 9660548 14490822 28981644