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28890043 = 713224421
BaseRepresentation
bin110111000110…
…1001110111011
32000100202200121
41232031032323
524343440133
62511114111
7500363350
oct156151673
960322617
1028890043
1115342576
129812937
135ca6a00
143ba0627
15280a02d
hex1b8d3bb

28890043 has 12 divisors (see below), whose sum is σ = 35753808. Its totient is φ = 22857120.

The previous prime is 28890031. The next prime is 28890053. The reversal of 28890043 is 34009882.

It is a de Polignac number, because none of the positive numbers 2k-28890043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28889990 and 28890008.

It is not an unprimeable number, because it can be changed into a prime (28890053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11028 + ... + 13393.

It is an arithmetic number, because the mean of its divisors is an integer number (2979484).

Almost surely, 228890043 is an apocalyptic number.

28890043 is a deficient number, since it is larger than the sum of its proper divisors (6863765).

28890043 is a wasteful number, since it uses less digits than its factorization.

28890043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24454 (or 24441 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 28890043 is about 5374.9458601925. The cubic root of 28890043 is about 306.8428887662.

The spelling of 28890043 in words is "twenty-eight million, eight hundred ninety thousand, forty-three".

Divisors: 1 7 13 91 169 1183 24421 170947 317473 2222311 4127149 28890043